SEPTEMBER, 1904. MONTHLY WEATHER REVIEW. 403 river in that section on which river and flood service is main- tained. The work of extension of the River and Flood Service has progressed steadily since July 1, 1904, the date on which the increased appropriation for that purpose became available, and by the end of September new stations hacl been er;tab- lished as follows: Milk River, Havre, Mont.; Big Blue River, Blue Rapicls, Kans. ; Republican River, Clay Center, Iians. ; Solomon River, Beloit, Kans. ; Smoky Hill River, Linclsborg, Kans., Abilene, Kans. ; Kansas River, Manhatken, Iians., Topeka, Ikns. ; Gas- conade River, Arlington, 510. ; Missouri River, Blair, Nebr. ; Minnesota River, Mankato, Minii. ; St. C h i s River, Stillwater, Minn. ; Red Ceder River, Cedar Rapids, Iowa; Iowa River, Iowa City, Iowa; Scioto River, Circleville, Ohio ; Kentucky River, Jackson, Ky. ; Powell River, Tazewell. Tenn. ; Little Tennessee River, McC+hee, Tenn. ; St. Francis River, Blarke(1 Tree. Ark. ; Neosho River, Neosho Rapids, Iians., Iola. Kans., 0smt.go. Kans., Fort Gibson, Ind. T.; Canadian River, Calvin. Ind. T.; Black River, Blackrock, Ark. ; White River. C’alicurock, Ark., Batesville, Ark., Clarendon, Ark. ; Arkansas River, Tulsa, Ind. T. ; Mississippi River, St. Cloud, Minn., Warsaw, Ill., Luxora, Ark.; Lehigh River, Mauchchunk, Pa.; Schuylkill River, Reading, Pa.; Delaware River, Hancock, N. Y. (east branch), Hancock, N Y. (west branch), Port Jervis, N. Y., Phillipsburg, N. J., Trenton, N. J.; Catawba Rii-er, Mount Holly, N. C.; Oconee River, Milledgeville, Ga. ; Tuba River, Colgate, Clal. ; Sacramento River, IinightB Landing, Cal., Riovista, Cal. Nineteen rainfall stations have also been established, and there remain to be established about 35 river and a few rain- fall stations. The highest and lowest water, mean stage, and monthly range a t 228 river stations are given in Table VII. Hydro- graphs for typical points on seren principal rivers are shown 011 Chart V. The stations r;elected for charting are Beokuk, St. Louis, Memphis, Vicksburg, and New Orleans, on the Mis- sissippi; C’incinnati and Clniro. on the Ohio; Nashville, on the CumlJerlaiicl; Johnsonville, on the Tennessee; Kansas City, on the Missouri; Little Rock, on the Arkansas; ancl Shreveport, on the Red-H. 6‘. Frii)iX.riijirld, Prc!fessor. _.. CLJMATE AND CROP SERVICE. By Mr. JAMES BERRY, Chief of Cliiuste sud Crop Divison. The following summaries relating to the general weather and crop conditions during Septeinber are furnished by the directors of the respective sections of the Climate ancl Ckop Service of the Weather Bureau; they are based upon voluntary reports from meteorological o b s e r ~ em and crop correspond- ents, of whom there are alrout 3000 and 14,0110 respectively: AZnbnmn.-Some locally heavy rain%, hut generally dry, hot weather prevailed, except rather cliol middle of niontli; light fiost in M’allter County on 16th. C’ottou continued to deteriorate fmni rust aud shed- ding during first two decades. bonie daniage I J ~ bnllwoi nis ancl preiiiatuie opening, greater poi tim open 1)y ~I I J W of uionth, wheu over one-half picked. Gathering of w i l y coru progiessed hliiwly, yielil ciiuttuuiuq very good. hIincw ci.ops fairly gotxl, though all late crop” injured l y drought.-8’. P. C h f e e . An.zo?ia.- The rainfall d u i ing Septemlicr miis generally less than nor- mal, brit crops did not suffer froni lack of niuistine TeniIreiatures were generally niodernte. brit the latter pait o f the nii,nth was rather cc~cil, and light frosts occurred in northein dibtiicts. But little daiiiage rewltecl, however, as crolis \\ere tiio far advanced. The uionth wits geiierally faroiable to agricultural interest.;, and c r o p did well. GI was abuivlant on ranges, and it cured nicely as hag, proiiiising plent winter feed. Stock was i n fine conditiou.-M E. Blystotie. Arkamns.-The temperature wab rxcebsive and the railifall deficient: drought caused late W O ~J ~ to deteriorate. C’ottun oIiened iapidlg: 1)ick- ing general at close of month; top i w p light. Good LWIJ of early corn being gathered; late prninibed a poor IXI)~J ov iug to lack of inoi.-turi,. Irish potatoes fair crop; sweet liotatoes good crop. Less than uhual acreage sown to fall grainh. as ground was too dry to idow. Apples Pair crop of iuediriin quality.-0. C. Burrows. CicI~oo,.,~itr.-Tenrgrratnre ant1 railifall rrroids were lioth broken tl ur- ing the month. A t Sau Francibco the iiiaxiniuiii temperature ou the Rth, lolo, was the highest ever recorileil f o i a n ) mouth. The raiufnll a t Sail Francisco from the 22d tli 26tli, 5.07 iiiches, was 4.bll inches aLiti~e the average for thirty-thiee jears, and it \+as eilually heavy titroughorit the ceutral and Iiortheru bectiou.;, with ~L I J U O I nially heal y downpours i n portions of southei n C‘ctliforuia. Tliuntlerstoriiis were more bevere aut1 frequeut than usual in all paits of the State. Heavy sno\v fell iu the high Sierra. Grapes, lieans, grain i n sacks. and uuprotected hay weie quite seriously damageil Iiy raiu-dlerrcder G . Mcddie. CoZorado.-hlontli favorable: fore p i t too illy for iilowing m i l sowing. but drought relipveil (luring kist ilrcacle. (:lain hiti \ est, Iiayiug. awl fodder cutting finished; thrashing unilrr \\a) : tieet ~irrlling m i l iicbtatii digging begun. (’om silniewliat iktuiageil Iiy frost ou 13th and 14th. brit by close of month generally u u t of danger of further damage. B:inge cured well, but WRS consideralily clamaged Iiy heavy rains duiing closing days. Fh-ida.-C4)ttoii pickiug wrxh generally fa\ cired by the lacali of iaiu ani1 a t the close of the month cotton was aliout three-fouiths I~arvrsteil: on account of the ravages of caterpillars and nther inwets the yielil was considerably lielow the average. Corn was mainly Iiousecl with fairly satisfactory yielils. C’aue did well arid cutting hacl eoinmenced in some localities. Citrus fruits had beguu to color in the central district.;, an11 marketing had hegun south. Fruit trees looked well, but gardens showed lack of rain.-R. T. Li?ul&y. During the first Fine crop% of fruit ani1 n i ~l o n s niarketwl.-F. H. Brm&trbitty. Georgia.--An unusually warm and dry September. Iialf cotton w:t\ damaged hy rust, shedding, ai111 caterpillars, top crop a fltiliirr: I Iolls tip~iie~l fast. many prematurely; piekiug progressecl rapidly, stalile geueially iiiarketed as f a d as ginneil: lalior scarce; yield above arrraqe; crvji itliout all gathered i n bCJUthern section, with raliid advance There. All minor crops seriori injured by drought. Corn crop g Iiou.;etl, yielil goocl. Large cr ; froht occurierl on the 14th a1111 15th (.tiusing U I , damage. Fa\oralJle weather followeil, and 1by the close (i f the iiiontli three-fourth$ of the entiie curii crop was hate ficini claniaye tiy l\illiiig frost. TVhrat seeiling macle ewellrnt prugresb, vuniing to good btaiiil and fields sliowiug green. Cotton pivhiug began about the Wth, antl potato digging about the thiicl week. A gi~od hay crop waq brcuie~l.- George Reetler. Mwitanct -The temperature was geneially favorable for crolis not j e t matured, and there was no niateiial dmiiage Iiy frost escept ti) pcitatoes in places. Rain was needed in urarly all secticinb; range feed ~e 1 y hliort as a iule. Cutting of second m t l third of alfalfa in lirngress throughout the nicinth. Wheat ani1 ciat h s complrtwl duiitig the third week and tlirashing by the close o f ontli. Potatoes \\pie a fair crop. Apples niaturecl and were of excellent rluality.-R. F. Ibim!]. Neb,.nRka.-SeIitember was allilo5t exactly a norinal ~iiontli as far a s temperature and rainfall \WIP concerned. Corn nmtureil well antl with- out injury by frost, the crop as x whole )being a very good one Hayi in some late fields was completed. and tlie third crop o f alfalfa n secured in gocid condition. A consiilerntile acreage of wlnter u heat 1% quichly and made excellent grou th.--G. A. Lorektnd. the State illiring the month, with about norins1 tvniperature ani1 light 1lrei.ipitatiou. Coutli- tioiis were favorable for maturing late ciups, harvesting grain, ani1 Iialing hay. No damaging frost occurred. Range feed \\as fairly good aut1 live stock did well.-J. H. Smith. New En!yltmd.-The btorlU of the 14-1Sth was heavy and \ ery general, giving at many stations over half of the monthly precipitation and causing winds of hurricane force on the southern New England coast. The kill- ing frosts awl freeze of the 33d and B3d were unusually early. Except- ing the storm ancl frosts mentionell, the weather was characteristic of the sea5on and very favoralJle for matui ing and securing crops and for fall plowing ancl seeding.-J. W. Smith. New Jersey.-Tlie month was favorable for all farmiug operations; late maturing crops suffered iiiaterially from drought during the first half. Heavy rains, 1&15th, accompanied by high winds, were very destructive to standing crolis; fruit blown from tlie trees aiid newly seeded fields and side hills badly washed. First killing frost, morning of 2Bd, did great damage to late corn ancl vine truck. A t doze uf month seeding of wheat was not completed in southern zection.-EtEirnrd 1V. IlfcGann. New J1e.ric.o -Crops were generally secured before frosts, except in mountain districts of the north. where late planted vegetables and ma- turing grains were damaged. The prospects for winter feed were con- sidered good. Stock was in very fair condition a t close of the month. Heavy raius during the last four days of the nionth caused extensive and destructive floods, washed away bridges and railroad tracks, carried away houses and crops in valleys and lowlands, aiicl caused borne loss of life.- J. B. Slonn. Ne@ l-ork.-The weather during September was mostly favorable for farm work and the maturing of crops until the ’Lad, when killing frosts Late potatoes were fairly well matured.-C. F. SI-hneitler. SOW11 llllder favorable ClJllllitiOllb, W l l i l r earl)‘ bOW11 W h e a t callle Up Neiradtr.-C;etirrally fair weather pre\ ailed o occurred, which considerably damaged buckwheat and corn, and apples in places. Light frosts had occurred on several previous dates. Seed- ing wheat and rye was finished and many fields were beautifully green. High winds in eastern New Pork on the 14th greatly damaged corn and apples, and disastrous gales on the 30th causecl at least a third of the apples to drop.-R. G. Allen. North Carolina.-The weather was generally quite favorable for har- vesting crops. A severe storm on the 14th and 15th caused some damage by heavy rains and high winds in the central portion of the State. Cot- ton opened quite rapidly and picking became general about the middle of the month; the crop was reducecl below the average by continual shedding. The curing of tobacco was completed, with good results as to quality, but with a sniall yield. Corn matured well. Minor crops, forage, ani1 hay yielcled well.- C. F. TOR Herrnann. North Dakota.-The weather during the fore Iiart of the month was un- favoralile for farin work, as rain prevailed in all sections, with low teni- peiature liotli dag aucl night. warm weather followed, when it turneil volil again, with a killi in the Missouri Valley, destroying all unmaturecl crops. Rain p again in tlie eastern portion, Iol- lowed after thv 96th lby a killing fiost in all parts of the State, debtroy- iiig all vegetativn. brit there wits littledamage. as all crops, except some late Bas and cuin, had matured.-F. J. Ricprrt. Ohio.-The rainfall was deficient, e5pevialIj over the southern portion. Wheat \vab far Iielon? the a\eiage i n most places. Buckwheat gooil yield. Ciirn not clamaged Iiy frost, except in tlie noitheast, but the yield wae gen~ially I~e111w ii~~riiial. Pastuies shoi t. Clci\er w e d poor yield. Con- hiderallle 1iriigre-s iiiaile in heeding of winter wheat. Tobacco good crop an11 nraily all lioused. Grapes m d pears gooil: ~icaclies fair; apliles Liir to g~)ucl.-J. lliirreii Smith. OkZt~honia.-The iiil)nt 11 was warni, with ne, Iurl. T. 3 \Vallon.:r ............ - u g a' LI e: a .- c Y .L, _. - 1.313 0. I;? 2. 46 2. I;li 2. 11:; 1. 36 I . 4s 0. :?i 5.111 ::. 44 2. is 3. 60 2. 5s 3. 69 3. lil 3. 6s 3. 14 1.51 ;?. s5 0. 27 ].!IS 0. 93 5.31 4. 79 4. 34 4. ?Y 2. 26 1. IjS 1.95 (I. 75 3. ii 9. 28 2. 46 1.06 2. II!l 3. YY .) i - _. .,.a 0.40 2. x? 0. 41: 1.76 4. H!4 0.46 Precipitation-in iuches a u d hundredths. (( Least mouthly. 3 ,. I 1 ~~ l l Greatest mouthly. -1.52 -0.51 -U. 77 +'). 29 1 1 .0 1 -2. 59 I t q d i n e .. .......... F'inal Ranrli ...... Kussellvilb.. ..... I'iiie C r 4 ......... Triiiialad .......... J u p i t e r ........... .......... .......... ...... ........... ........ -0. 2 i -0.01 -0. 04 +lJ. .ilj $0.11 -1. It I 0.22 -1J.94 -n. o? Fiircla Frrry ...... Ilounl~l~nuvillr .... .~~~u n ~~o l i s , h l d .... hIsl.klllal. 1 d :l U ~l .. . I'nlerlaiuis ......... hlrriolian .......... lbu~nrvill? ......... L.llllrdr~r ......... l-ork .............. A w t i 11 ............ -],!I:; 1 1 Pattrn. Me. ....... ........ ........... -1.15 1 1 Rav . City ........... i0.14 ~~ Iiorduu' ............ ....... Lar Xarixs ... ....... .......... ........ ........ ~ ~~ * Maiue. New Hamushire. Veruiuut. hIasmchuzetts. K h d e 1 4 ~n ~l . and Conuecticut. 6. 92 9.15 7. 91 fi. 53 9. 7 2 1.42 5. i:! 3.11:; 1 RcittyrillP ........ Rliu~lrn ............ (iralitrville Md.. .. Imliugt ilu .' ........ T.urerne ........... 2 statidmu .......... Sara,o,xie.. ......... 5 stations .......... ('t.utrnl City ....... lily .............. .... T ........... 0.00 ............. T. ....... 0.70 ............. T. .......... 4.55 Labst t'rI?t.k.. ........ 0.43 Y. 2n ' 1 J ~n ~l ~r v i l l r . ......... 1.90 1.34 1 1 3 stativus ........... 0.0~ picking was well advanced by the end of the month, beiug practically completed in the bouthwestern counties. Chtheringof corn was delayed, owiug to the great demand for labor in the cotton fields; early c o ~n wab good b u t late planting was badly damaged by tlie diought. Rice har- vesting was interrupted by the rainh, but good progress was generally made. Cane niatrired nicely and prospectb were good for an average crop. Considerable grain was bown under favorable conditions. Gar- dens did well. Pastures and stock were in excellent condition. The hay crop was fine.- W. H. Alemnder. Utah.-Fine warm weather during tlie first two decades was followell by rains, cnlder weather, and killing frost. Cropb were nearly all housrd in g(ioc1 condition, except Iieets and potatoes, which were being h~iuwtl. Sugar beets were above the average aud bugar making WRY begun. Fall seeding was well advanced. Thrashing results from arid falab e\ceedeil all expectations. Winter apples mere abundant and of good quality. Alfalfa was above the average. Pasturage was good and stock were in good condition.-R. J . Hytrtt. Virginia.--The rainfall of tlie month was considerably less than the norilid, and tlir trniperature, also. was gleficiput. The tillewater scction rectbivrd ain~ile rain for crop pui pose.?., llut in the taetitral an11 niouutain 1mrtimb if the St'tte i.oiiilitions were m ~i e or l r s tlioughty. Little inj iiry occur~~cl to clops. however. a+ they mere generally too far ad- vitncwl t i ) lie ~nitteiinlly affected 11s meatlier ( onilltion+. Harveqt o f late coru and toharcn was finished rluritig tlie 111 mtli. Fall beecling \vas (le- lityed 1)y the dry weather.-E~r~cifLr(IZ A. EIWIA. 1VwJihgton.- The inonth \%ah dry aud warm, with con+lerable smoki- ness. The rain of the Xth laid the dust we+t o f the Cascade Rlonntains, and none fell on the ea+t side; tlie rain nt' the 3%1 was general over tlie State, with scatteriug+howers to 48tli, escrpt i n central part, where none fell. Whrat, oats, lmrley, alii1 hay, mere garnerell in excellent coudition. All vrolis mere lbelow the average. Fall seeding prlqressed. Potato crop light. Apples fine crop; pastureh rei ivetl a t end of month.- WaZ- lin i)t Bell. Weat T'iryinici.-Drouglit continued iluring the entire month, and se- riously affected vegetatitm. Fall plowing progressed 4owly, and consid- erable seeding remained to be done. Corn WRS not much damaged by 406 MONTHLY WEATHER REVIEW. SEPTEMBER, 1904 frost. A t the close of the month corn was mostly in shock, and buck- failed to ripen and was cut for fodder. Apples were plentiiul and of ex- wheat was mostly harvested, with fair yields of both. Late corn dried cellent quality.- W. M. Wi'ilson. up, and was mostly cut for fodder. Pastures were very short and water Wgomtg.-The month was favorable for the completion of haying and scarce, but stock were in fair condition. Winter apples were being picked harvesting wThere that work was not completed during August. A good with prospect6 of about n half crop.-E. C. Voose. crop of grain was secured where the frosts of summer had not damaged Wisconstn.-A general frost occurred a t most points in the interior on tho grain. Good range feed was general throughout the State, and stock the 15th, 21st, and P2d. Pasturage was excellent for the season through- were in excellent condition. The absence of any suow during the month out the month, and fall seeding of winter wheat and rye ohtained an ex- over the greater portion of the State was very unusual for September.- cellent start. The rains iuterfered to some extent with the digging of W. 8. Palnier. potatoes, but a large crop was secured without damage. Much corn SPECIAL ARTICLES. A NEW THEORY OF FOG FORMATION.' Trauslated hy FRANK w. PFON-TOR. [Iuterlwlatiou. by the trm4ator are IU bmcketz.] Of all the theories concerning the formation of fog, but two have been accepted u p to recent times, one of which is now universally held. But it will appear that both are not in harmony with our observations [Aeronautical Observatory, Royal Meteorological Institute of Prussia], and with the latest physical investigations; and accordingly me must seek a new esplanation. * * * * I: * * The Davy-Dines theory [that condensation is clue to the cooling of the earth's surface ani1 its herbage by radiation] has been authoritative up to the present time, itncl is found in Hann's Lehrbuch der Meteorologie. * * * 4: .I: -I: * I u order to show that this explanation does not satisfy the facts, esact moisture measurements in tlie neigli1)orhood of the earth's surface are necessary. These were made in l W 3 by Honi6n2; and it was shown by him that fog can not arise simply through the radiation of the ground. I n view of the great importance of those investigations to the present study, let us look into the matter more closely. Hom6n observed that the dew-point fell a t the earth's surface ancl in the lower air layers when dew began tu form. It follows that as soon as the air a t the earth's surface has cvolecl below tlie clew- point, tlie water vapor condenses out of the stratum imine- diately above the earth's surface on the cold underlying surface. Thereupon the I T L ~J O ~ pressure diminishes consider- ably in the lowermost layer, and the vapor from tlie hyers above conies to tlie earth's surface by diffusion, where it, also, is condensed. Thus there occurs a continuous progression of the wat,er vapor from above down\vard. Horn& iuaintained that the downward diffusion a t the bot- tom went, on faster than the incoming of moisture from abore, so that in spite of steady decrease of temperature, saturation could not oocur. ani1 Rubenson ' had before yielded a similar result. Hamberg found. for example, that a t the beginning of the night, a t six and six-tenths meters heiglit above the earth's surface, the relative humidity rose froin 70 to 90 per cent, and toward the end of tlie night from 05 to 98 per cent. From these obserrations H o m b clren. the above- mentionecl conclusion. Neverbheless it would lw conceivable that in cases where the drying goes on more slowly than the cooling, light fog might form. On the answer to this last question, viz, whether tlie dry- ing can proceed more slowly than the cooliiig, the decision in regard to the hitherto p e r a i l i n g fog theory clepencls. Homin could have answered this through observation by means of his dew-point measureliients of August 19-13 and September The observations of Hamberg ~~ 1 Extract from Pie E I I ~~I I I I I ~ una1 Alflii>ling clr5 Nrbrls von Hrrmann Elias. Berlin, 1904. Reprinted -from Ergelinihqe iler drbeiten ain Bero- nautischen Obserratoriun~. 1 Olitnliel, lWIl, his 31 I)ezen~her, 11WV2. 1 Honi6n. 3 Haniberg. Bodenlill3.sikalisclle und nieteol. Beoba(.ht, lYl4, p. 171 ff. Om nattfrosterna, etc.. lH74. p. X 4 cmd La temp6raturr et Nova Akta R. S. S. Upalien- l'humiditi: de l'air h clifierentes hauteurs. sis. sigt af K. Sv. Vet. Akad. Fiirhandl. 1875, No. 1. 1879, Vol. S , No. 4. 4 Rubenson. Om temperatur-och fuktili~tsfurli8llandrna, etc. Gfver- 6-7, had he secnred trustworthy synchronous temperatures. Then it woulcl have appeared whether the cooling of the air, i. e., the conduction of heat, goes on faster than the diffusion of the water vapor. This question must therefore be answered in another way. If we assume that a t the height of one centimeter above the earth's surface, the air is saturated a t t: while a t the earth'ssur- face tlem making begins a t f,", then in the course of time vapor will cliff w e froin above clo~vnwarcl, while simultaneously the higher temperature approaches the lower through conduction. For the sake of nimplicity, let lis assuine that during the whole tin10 the temperature of the earth's surface remains a t t,". Thus it becomes warmed neither by condensation nor through the importation of heat from above, ani1 i s not cooled through radiation, which is the inore admissible as the different in- fluences will more or less oEset each other. The upper layer will thus finally acquire the temperature t t of the lower. Con- densation will L ~O N begin in the upper layer if the vapor ten- sion is a t least equal to the ~a p o r tension a t t:, or if less than the difference of water content R hich can esist in the air a t f,O, and f,O is diffused in tlie same time that is needed for the dif- ference of heat f,' - t," to pass by conduction through one centimeter. The sxue result is more conveniently reached if we calculate, on the one liantl, the time required for the difference of mater content of saturatedair a t t," and t: to diffuse through one cen- timeter, and, on the other hancl, the time necessary to trans- mit a temperature difference of 1' one centimeter in the air. It follqows, then, that, if the conduction of heat proceeds more rapidly than the diffusion of the water vapor fog forma- tion can take place. I n the opposite case, this is impossible. The quantity, S, of a gas which in time 2 passes by diffu- sion through a cross section, q, of a tube I centimeters long, nlien the density of tlie gas is do a t one end of the tube ancl d , a t the other end, is, as is well known, espressed by the formula A calculation of this kind, however, is not easily made. or, when d, - '1, = (1, where X. is tlie coefficient of diffusion, i. e., the aniount of gas which is transmitted through cross section 1 when all the other quantities on the right-hand side of the equation = 1. For tlie present case we assume 9 = 1, and according to the foregoing assuwption 1 = 1; then it follows that .C' I . 2--. ' - ktl ,S is tlie quantity of water vapor diffusing in one cubic centi meter of air.6 This amounts, a t a vapor pressure' of e,, to 6 S ib here the quantity of water vapor whose time of diffusion through one centinieter of air is to be calculatrd. 8, and So are the total amounts of water valior in one cuhic centimeter of saturated air at temperatures t, and to, respevtively.-F. 0. 8. 7 Hann. Lehrbuch der Meteorologie, p. 219. bHom6n. A. a. O., pp. 174-175.