i.lvVU AS A KACIAL I'OISON 



That lead poisoning can effect the germ-plasm of guinea pigs is indicated by experiments under 

 way at the University of Wisconsin. These photographs of results were supplied by 

 Professor Leon J. Cole, who writes: "Each of the ijhoK.graphs shows tw() young from the 

 same litter, in all cases the mother being a normal (non-poisoned) all)mo. In each ot 

 the litters the white young is from an albino father which received the lead treatment, 

 while the pigmented offspring is from a normal homozygous pigmented male. \\ hile these 

 are it is true, selected individuals, they represent what tend to be average rather than 

 extreme conditions. The albino male was considerably larger tlian the pigmented male; 

 nevertheless his young average distinctly smaller in size. Note also the brighter api)earance 

 of the pigmented young one." (Frontispiece.) 

 See Livc-Slock Genetics, p 21. 



