FEBRUARY, 1903. MONTHLY WEATHER REVIEW. 71 Atmospheric pressure. Instruments for measurement; barometers; aneroid, mercurial self-registering; thermometric-hypsometry; cliurnal and annual variation of atmospheric pressure. Variation of pressure with altitude. Laplace’s formula; applications; reduction of pressure t o sea level; calculation of altitudes by means of barometric observations. Wind. Measurement of direction and of velocity of wind; weather vanes; velocity anemometers; pressure anemometers. Diurnal variation of velocity and of direction of wind. Variatiou uf wind with altitude; general relation between the wind and pressure: gradients; theory of atmospheric movements; relation of wind to trni- perature; influence of rotation o f earth; deviation of wind on graclirut. Regular winds; trades, anti- trades; distribution of wind and pressure a t the surface of the gliilw; seasonal winds; monsoons; diurnal winils; land and sea breezes, IUOUII- tain and valley breezes. Atmospheric vapor. Evaporation; measure of evaporation; diurnal and annual variations of evaporation; general lawz of evaporation. Atmospheric humidity. Elastic force of water vapor; relative hunrid- its; instruments of measurement: hygrometerh; c-hemical; condruhit- tion; self-registering; psychrometer. Diurnal and annual variations of humidity. Variation of humidity with height; distribution of humidity at surface of earth; condensation o f water vapor, various modes of condensation in the ascending L‘Urrellth of air; dryness in the descending currents: production of the foehn. Cloudiness: niea-we of cloudiness; heliograph; annual and clii~rnal variatii )ns of t+loudinrhh: general distribution of cloudiness at the surfare of the earth: study (if movements of clouds; classification of clouds; avrrage altitnile of dif- ferent forms of cloudb. Optical phenomena of the atmosphere. Dew and Frost. Formation of clew: inraquiement of tlew; practical importance of these phenomena; frost; hoar fro-t; glazed fmht. Rain, snow, hail. Measurement of rain: rain gages, their installation. Theoryof the formation of rain. Rain< of various origins; rain+ tlnr til convection; cyclonic rains; rain- due t t ) on)graphy; iuHurnce of topi- graphical conditions, of forests. General distribution of rains a t the surface o f the glolw. Rainy reyit 1ns: desert regions; detailed study of rain in the different rrgions: rainfall system; distribution of rain throughout the seasons; intensity o f heavy shgwers. Snow. Constitution and density of snow; effect of snow: limits of per- petual snow. Natural utilization of meteoric waters. Percolation: 5urfac.e Him : water consumed by evaporation and by vegetation; sulqily of undt.1- ground waters, of springs, and vf river-: drainage syhteni of watet ; risings and floods, their prevision. Depressions of temperate latitude- antl cyt.l( i n of tropical regions, their constitution: tlistribution i )f winil a l i l J I l t crnte of low pressure. Influence of barometric depression on the weather. Lnm1 winds pro- duced by the passage of depressions; mistral, hirocco, foehn, liora, rtv. Laws of movements and of frequency of barometric deliressicins a n d of cyclones; their velocity, their average Iiatlis. Various cauhes o f the circulatory movement; causes which tend tu nwdify their velocity, their paths, or their intensity. Atmospheric electricity, lightning. flash of lightniii;?, thunder: frequency of hourly. wasonal, and geographical rlistriliut il811 of thunderstorms; origin of thunder~torm~. thlll1d~~htO~lllh o f heat, antl cyclonic thunderstornis; hail, formation of hail: inran< p r ~p ~h e d for ilv- fense against hail. Whirlwinds and waterspouts. their effects. their origin, ant1 their rp- lations to thunderstorms; heat storiw. Forecasting. Short range systeni of forecahting: urganizatiim of fore- cast service; general principles of forecasting. Forecasting by isolated ohservers. Utilization o f o~~servation~ and of local signs; prevision of frost in spring time. Discussion of attempts to forecast at long range. Cosmical influences. General circulation of the atmosphere. Properties and constiLution of cloudb and fogs. Rainbows; halos; coronah. The law of storms. Anticyclones, their origin. Thunderstorms. InHuence o f anticyclones on the weather. Periodicity of bllnS1iotS, rliscuzsion of rrlations they present to meteorological phenomena. Discussion of influenew at- tributed to the moon; reddish sunset; other inHuencrs attribntetl to cosmical causes. Can inan inHueiice vliniatr? Effect of deforestation, of reforestation. Problem of variability of climates. Attempts to produce rain. REOENT PAPERS BEARING ON METEOROLOGY. W. F. R. PHILLIPS, in charge of Library, ete. The subjoined titles have been selected from the contents of the periodicals and serials recently received in the library of the Weather Bureau. The titles selected are of papers or other communications bearing on meteorology or cognate branches of science. This is not a complete indes of the meteorological contents of all the journals from which it has been compiled; it shows only the articles that appear to the compiler likely to be of particular interest in connection with the work of the Weather Bureau. Unsigned articles are indi- cated by B -. Quarterly JotLrnal of the Royal Meteorologictcl Society. Lon&. Vol. 29. Bayard, F. C. English Climatology, 1881-1900. Pp. 1-21. ~ The Bora in the Adriatic. Bellamy, C. V. The Rainfall of Dominica. Pp. 23-28. Bellamy, C. V. Clayton, H. Helm. The Eclipse Cyclone of 1YlO. Pp. 47-58. -St. E1nit)’s Fire. ~ Rainfall of the Hawaiian Islands. P. 21. Notes on the Climate of Cyprus. Pp. 29-11. [Note on 1ette.w from a. Fellows and Charles [Note on Iiamphlet by C. J. Dibdin.] PI). 55-56. Lyons.] Pp. 51:-57. Terrestrial dfugnetimn. Boltimore. 1Tol. 7‘. Bauer, L. A. Results o f International Magnetic Observations inacle during the Total Solar Eclipse of May 18, 1901, including re- sults olitainecl during previous Total Solar Eclipses. Pp. 155-192. Pegram, Geo. B. Elhter’s ancl Geitel’s researches on the Radio- Activity and the Condu(.tivity of the Air. Syninnr’a Neteorological Magazine. London. Vol. 28. Stupart, R. F. The Chnaclian Cliniate. Pp. 1-1. __ Temperature of Air and Rivers. [Note on paper by W. Andson.] Chree, C. Preliminary Note on the Relationships between Sun- Taylor, J. E. Characteristics of Electric Earth-current Disturb- Pp. 335-337. Evershed, J. Solar Eclipse of 19W4 May 28. General Discussion Ward, R. DeC. Scientific Investigationz 1jy Weather Bureau men. Ward, R. DeC. Cycles of Prec%ipitatiou in the United States. Langley, S. P. The L L Solar Cbustant ” and related problems. Pp. Bigelow, Frank H. Reply to E. von Oppnlzer‘s remarks on Bige- Pp. 202-304. Pp. L 6 . Proceedings of the Royal Society. Londori. 1-01. 7’1. spots and Terrestrial Magnetizni. ances, ancl their Origin. o f Spectroscopic Results. Pp. 228-33Y. Pp. 331-234. Si.imccP. Lorchic. I?. 5. J7d. 17. P1J. 353-351. [Note on article liy L. H. I\lurdoch.] P. 354. Antrophysical Journccl. Chicago. 1-01. 1:. 89-99. low’s h L Eclipse Meteorology.” Pp. 161-163. tTou)vi(il of Brogrccphy. Chicago. Vol. 2. Journal of the Frutcklin In&itute. Philaddphicc. Vol. 16.5. ~ How the Weather Fixes Train Load<. Auria, Luigi d’. Pp. 15-46. Relation brtween the Mean Slieed of Stellar Mo- tion ant1 the Vrlocity of Wave Propaption in a Universal Gaseous RIediuiu Bearing ulwn the Nature oi the Ether. Storm Hows from city areas, and their Pp. 207-211. Engineering Netcis. New Ihrk. Vol. .{S. Clarke, Ernest Wilder. calculation. Pp. 386 388. Nature. London. 1‘01. 67. Lockyer, William J. S. netism. Pp. 377-379. Marriott, Wm. B , (3. H. Lockyer, William J. 9. Indian Rainfall. Pp. 391-395. Chree, Charles. Magnetic Work in Nrw Zealantl. Pp. 118-419. ~ Circulation o f the Atnin+phere in tlir Tropical and Equatorial Regions. [Note on statrnieiit by Profeswr Hildel~randsson.] Pp. 298-301. London, Edi?iburgh, and Dublin Philonophicnl bI