Document Ev0R0x5eVZv3O3RYZ7gb7GDY4

! CHICLE DEVELOPMENT COMPANY SOO FIFTH AVENUE New York Ady KtH 3M& n S'r* ChisriiJS Vrsly Sum * s>O0 i i f t i i /.v'&ris*# York *n \\ X\ \> // h eixw ith oopy a a le t i z i* d a te d A lly J*.*2%kk 'iBSBkjiirW'^d t o smk * * 2r* *Ji* Cmsg i l l fiereiis hmmrm&safpd oplal<j\)\ th* mi X* A* sosti as tr re ive t*e o t h e &$ cr$ eti Ch i c le Cmapi^ m t i a rt-p s rt* they riti fertfsrded f i l l th e h ave r e c e iv e d tins sii t h e i'ia iii ssreiij c e a sh* Joub||ly he y re jj ^ tor tmhXSigtsas* teldag loft masiteration &* f t^ r W p e ss ih & p J fsy sue*tif3S* \ teasr v ery tr u l y .-.r--* -V/fMi s s e l {1} e arn s c im iiis c a ffjjr /> ' ini* tafees# Frfi&ldettb* s e i IHJA H 3 ahLu#S JCiCCC y SCFsJ:C U & f  JUly 10th 1936 Mr SS Yates* Pros C h ic le Development Company 500 F if th Avenue Hew York C ity * Dear Xr Yates* X have read your re p o rt of th e X contam ination work and th in k i t i s a good re p o rt The follow ing s u g g e s tio n s come t o mind a s w o rth y o f y o u r c o n s id e ra tio n * On page IS o f PART TWO you s ay som ething about th e chem ical methods used f o r X a n a ly s is b u t you do n o t s t a t e e x a c tly th e re fe re n c e s to th e methods Inasmuch as th o re p o rt w ill pro bably be re fe rre d to government chem ists fo r study* I suggest th a t you w ork in to i t somewhere th e e x a c t re fe re n c e t o th e Xehoe method w hich employs th e x -ra y technique* and sim ila rly * th e ex act re fe re n c e to th e method used by Dr P r e s c o tt and h i s a s s o c ia te s The governm ent c h e m ists w i l l w ant t h i s in fo rm a tio n R eg ard in g t h e H orw itt-C ew gi 11 method* i t w i l l s u ffic e * I th in k * i f you make some such s ta te m e n t as t h e fo llo w in g * 51T h is i s a m o d ifie d d lth is o n e te c h n iq u e i n w h ich th e f i n a l determ ination involves a titr a tio n in stead of a colorim etric* photom etric or o th e r technique* Drs H orw itt and Cowgill p lan to p u b lish th e d e ta ils o f th e i r method and to re p o rt experim ents showing th e v a lid ity o f t h e i r te ch n iq u e when compared w ith others* and i t s value o f recovery* and o th er experim ents w hich c h e m ists commonly employ when d e v e lo p in g a new a n a l y t i c a l procedure They are prepared to fu rn ish a d e ta ile d d e sc rip tio n o f t h e i r method as a supplem ent t o t h i s re p o r t i f th a t i s deemed e s s e n tia l A com parison o f i t w ith th e o th er methods used in t h i s in v e s tig a tio n a t th e U n iv e rs ity o f C in c in n a ti and th e Mass I n s t i t u t e o f Technology i s shown i n th e p re s e n t re p o rt prove h e lp fu l to you X hope t h a t th e s e comments may Very t r u l y yours George S C ow gill*