February, '16] 



MOORE: FUMIGATING ANIMALS 



75 



old male in the normal set increased somewhat in weight, apparently 

 not being quite full-grown. This was not true of the old male in the 

 fumigation set, but this was not due to the fumigation, as he had been 

 in my possession for six weeks previous and had not gained. The 



Fig. 5. Curve of gro^^•th of fumigated guinea pigs. No. 1 a male and nos. 16 

 and 17 young males. Average weights of litters of young from nos. 6, 7, 8 

 and 11. Nos. 6 and 8, females, were pregnant at the beginning and end of the 

 experiment. 



