50 I. LESLIE 



found over a 60-day period, a 119% increase in DNA-P/thyroid and a 

 210% increase in PNA-P/thyroid. The feeding of the insecticide aldrin 

 (hexachlorohexahydrodimethanonaphthalene) to mice over 13 to 25 days, 

 produced an enlargement of liver parenchyma, accompanied by a much 

 greater rise in DXA content than in PNA content; the brain tissue showed 

 no comparable changes under the same treatment.-^^ 



2«* E. Annau, Can. J. Biochem. Physiol. 32, 178 (1954). 



