Dr. Fhncis Crick
%wrtment of l%ysies
Cavendisf; Laboratory
Ihiversity of Cambridge
Eimbridpe, &gland

Dear Frsncisr

In dfctatinf- a letter to cydney,  I fomd that I had

made an omission in describinp the cmroaition of the induction
medium contained in my letter to you.
add 0.lN KC1.

To the componer!ts listed,

I mieht 2s well take this onrortunit-r to ask a question

which hrl8 beeE kotherinF me.  I recall late on? eveninp eiiving?
copnac and listeninp to vow arguments cn the `lcomnaless  odd,^'
I wis under the imression tbt 1 underskorf it thoroiiphly and
could forpe all the links wben necessarT.F.  1 discovered, howevnr,
rscentlv in tryiry tc rwrorJiice it thqt f can't,  Tresima51y if
I had to I rrobably could, but ft wovl.' 5~ so much easinr if you
would just jot, frown the argwnt for TC, or nerhans you have by
now committed it to the seTi-pmnence of` th;> nrivately miqeo-
pranhed communication.

Sincerely yours,

S. S~icyalmn
Pro'essor of Z-cteriolop