Dr. Curt St8rn
Dapt. zoology
univecartty of bltfornia
BerkeZsy 4, Calif'.

Dsar curt:

Like most other geneticist8, I hme had in the bak of w mind for a
long tdnm th problem of gametic selection, on an experimbntal basis. But
it aeefmd ti, me that the laa k of vre& progress in this field reflected a
dsfiaPssmy in 4218 experimental mater&l. How aould one expect to make aig-
niiioant teeter on mioe or rabbits, with al.1 the difficultisa of proving
a rsi&iflcant effect on a Ii&ted 8amp3.e of progeny. My thoughts were then
turning (purely hypothetiaally) to the & priori desiderata, and in fact to
fbh, or psrhapa aam aquatic iIW8r~br8tO8, a6 nppropriate mat&M.

So ii WEUP idmW8bd and surprised to hear recently from &anther Stent
that one of your 8tudenCg has accomplished this tour de force with rabbits.
He reported that very subattultial separations of X- from Y- spermatozoa
were possible by oataphorasis, and were amply confirmed by changes in the
88X X%LtiO Of the Offc3pSing.  I tm writing to ask you to confirm this report
and whetbar you ciin give any more details. Is tie ma+~rial `published*`?

If the story ZEl We, I zm sum you would be very deeply concerned over
thar 8OC&L bI$dioatiOQi!J Of aucrh 8 bCMlb8b11. -dh8t Steps hWe #OU UOntefJ&ated
or taLn?

Youra sincerely,

     _
Joshuii Lcderberg