Document Nekb4DO3Z2YDkMw95XVE0bq4R

Dr * Gr a h ran E d g a r Et h y l Ga s o lin e Co r p o r a t io n Ch r ys le r Bu ild in g lieu Yo r k Ci t y Hew Yo r k De a r Gr aham * I th in k you a r e q u it s r ig h t in h a vin g ce r t a in r e s e r v a t io n s about th e a d v is a b ilit y o f p r o vid in g t e t r a e t h y l le a d fo r use as an in s e c t ic id e in t h e m a n n er a d v o c a t e d b y Mr . ? . Mor ga n o f t h e W* T* Ra w le ig h Gas p o n y. I s h o u ld c o n s id e r t h i s a v e r y u n w is e u se o f t e t r a e t h y l le a d and I sh ou ld r e ga r d i t as q u it e u n w ise on t h e o a r t o f th e Co r p o r a t io n to pr om ote t h e u se o f t e t r a e t h y l le a d fo r t h is p u r p o s e . However i t may be o f some in t e lle c t t c you bo know t h a t Ga lo o t t o f Du Po n t 3 made 30me o b s e r v a t io n s s e v e r a l y e a r s a go on t h e p r e p a r a t io n o f e m u ls ifie d t e t r a e t h y l le a d fo r t h is p u r p o s e . I t was Ca lc o t t *s id e a , w hich he cla im e d to h ave s u b s t a n t ia t e d w ith s u it a b le e xp e r im e n ts , th a t w ith th e t e t r a e t h y l le a d in e m u ls io n in an aqu eou s m edium , i t s a b s o r p t io n t h r o u gh t h o s k in on c o n t a c t w ould be p r e ve n t e d * I m ust c o n fe s s t o a c e r t a in s k e p t ic is m on t h is s c o r e , and I w ould n o t r e ga r d any e xp e r im e n t a l work as ve r y co n v in cin g u n le s s I t co u ld b e shown t h a t th e a p p lic a t io n o f su ch an em u lsion t o t h e s k in o f e xp e r im e n t a l a n im a ls w ould f a i l t o p r od u ce le a d a b s o r p t io n * In a n y ca s e I am q u it e s u r e t h a t t h e . f i n e l y d iv id e d s p r a y in th e a tm osp h e r e w ould be a b s o r b e d t h r o u gh th e p u lm on ar y e p it h e liu m . I t h a p p en s t h a t I have s e e n ca s e s o f lo a d p o is o n in g fr om t h e u s e o f le a d a r s e n a t e s p r a y s . (Perh ap s I sh ou ld say a ca s e fo r I have seen o n ly one a u t h e n t ic ca s e in a s p r a y e r ,) I sh o u ld fe a r t h a t a more r e a d ily ab sor b ed le a d com pound, su ch a s t e t r a e t h y l le a d , m igh t p r od u ce a h ig h e r in cid en ce o f le a d p o is o n in g among th e se w or ker s th an has been seen in th e le a d o f le a d a r s e n a t e * A3 t o t h e e v e n t u a l f a t e o f t h e m a t e r i a l s p r a y e d on t h e t r e e s , I s h o u ld e xp e ct t h a t th e r e s id u e m igh t c o n t a in le a d in s m a lle r q u a n t it ie s th a n a r e fou n d w here le a d a r s e n a t e is em p loyed * However I was le d t o b e lie v e b y t h e P o m o lo gica l Gr o u p " t h a t i t i s h i g h ly im p o r t a n t t h a t t h e r e s id u e s h o u ld r em ain on th e fr u i t fo r a co n s id e r a b le p e r io d o f t im e . Acco r d in g to them t h is was th e o n ly way in w h ich th e f r u i t co u ld be more or le s s p e r m a n en tly p r o t e ct e d a g a in s t th e c o d li n g m o t h . How ever I am n o t p r im a r ily i n t e r e s t e d in t h e e f f i c a c y o f a m a t e r i a l a s a s p r a y . I am m uch m or e co n ce r n e d w it h th e h a s a r d s o f p r e p a r in g and h a n d lin g a more or le s s c o n c e n t r a t e d b a s e s o lu t io n fr om w h ich t h e f i n a l s p r a y compound i s t o b e p r e p a r e d . I t w ould r e q u ir e some f a i r l y co m p r e h e n s ive e xp e r im e n t s t o c o n v in c e me t h a t a two p e r c e n t e m u ls io n o f t e t r a e t h y l le a d in an o i l d ip w ould n o t be absorbed In s ig n ific a n t q u a n titie s through the sk in o f p e r s o n s who h a n d le i t . Ce r t a in ly t h is s h o u ld n o t b e a u th o r ise d w ith ou t adequate e xp e r im e n ta tion and I , p e r s o n a lly d o u b t t h a t s u ch e xp e r im e n t a t io n w ould b e j u s t i f i e d fr o m t h e p o in t o f view c f th e E t h y l Ga s o lin e Co r p o r a t io n Ve r y t r u l y y o u r s f RAKji a Ko'b e r t ""_4. Ke li'o e , 'M"."Dv IT 0 0 0 9 9 4 9