Document vVqXD34dEo8Q34rODjJ5bwX3E

PLAINTIFF'S EXHIBIT MON-350 ruly 23,1959 2r. John. " ' hl '.e "onsantD Ghenj cal Company I3C3 t-C.'-j Ite-SS. 5 1632 Pear hr. 1 "i ivc lo t.ank you for your i.jterosting letter of July 24 and for trie pound of Gantocel, which you are sending. Y.'ith hr* f-uy'-rc *.:e ha;c a cue vc./-; . :oh inter.:, c lot in corking rdth various forms of silica in ;m attempt to discover the me chard, cm \y ch it c,certs is ;cc h upon h:a aoGy* Y'o liAve not been ablo to demonstrate that silica gel, as ordinarily y'3,. r- .. a urlificully .^nyiiaioa Lc fur,.iin variable water contents, are capable of causing fibrosis* In fact the only vllofirl rill.-a '.hat has inn biologically active is a natural diatomite* This substance, in pure state, causes as nv.ch fibrosis os _,, .01 : s itself* fft -4.-. w.1o^ ularly inter ;stc- inhi,at you had to say about tho formation of cristobalite in crystals of colloidal dimensions. *.c bare ^cund that ordinary ld.gk-temperature cristobalite is even more active than, normal quartz, but I had not op:' reela ::ed t" * 1- ^ - J-. f* 3' **0 i. ar ; 0 could form at such low tenner a taros in the cryStalina sizes that you mention* I would ask whether you have had x-ray diffraction matron 10 h-.vlo of the freshly prepared aerogel and compared them with c.l- liar patterns from tho 'finished alcogol? I v/ould feel tort thin right bo highly instructive. c O'a ; i^ao'^r -v -*1 that vr. -..ill h.eop you in for.uod of any results tliat v;e r.ay obtain. hhanlc you for your cooperation. sincerely yours. LIIGiCG Leroy U* Gardner, M.D, Director > V i 1 it'll!,