June 25, 1 9 i*7 Dr# Kenneth A.

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UNIVERSITYof ILLINOIS COLLEGE of AGRICULTURE AGRICULTURAL EXPERIMENT STATION URBANA,ILLINOIS Depa r t men t of A n im a l H u s b a n d r y J u l y 3^ 19 4 0 Dr.

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N13240 as an outgrow th o f ex p e rim e n ta l work on le a d a b s o rp tio n and le a d p o iso n in g w hich had been c a r r ie d on in the D epartm ent of P h ysiology s in c e 19^5* The la b o ra to ry b u ild in g and i t s fix e d equipm ent were made p o s s ib le by a g i f t o f $130,000,00 made to th e U n iv e r s ity j o i n t l y by th e E th y l G aso lin e C o rp o ra tio n , E* I , duP ont de Nemours and Com pany,.

Th e Lo w e Br o t h e r s Go m pa n y ESTABLISHED 1072 Pa e n t m a k e r s -VAk n i s h m a k l r s DAYTON, OHIO, U .S.A.

Bflyel- FM 11 cts -E tofani - 19 2 9 Age in years 20 - 24 25 - 29 30 - 34 35 - 39 40 - 44 45 - 49 50 - 54 55 - 59 60 - Barrel Fillers Ethyl Age fX 10 21 62 25 74 25 06 17 18 22 fx 0 2 12 6 28 10 0 7 8 73 Kun = -- = 3.318142 1 22 ira2 = 519 = 14 .499826 2 22 (FfUi) 2 = 11.010066 Pi2 = 3.489760 Sigma = 1.868090 x 5 = 9.340450 nr. _ .67449 x 9.540450 _ 6.300040 6.655249 = + .949767 ' mean = 3.518142 x 5 + 22.5 p tp = 39.090710 years _ .67449 x 9.340450 -------- j = --- :---- M 22 6.500040 4.690415 = 1.343173 .

Kettering Laboratory University of Cincinnati Cincinnati, Ohio x Dear Dr.

January 9, 19^5 r.

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