324 



INFLUENCE OF HYPOPHYSIS-FEEDINCt ON SIZE 



Hypophysis-Fed Aitimals Compared with Liver-Fed Animals. 



Several food substances besides earthworms had been tried out, but 

 none of them gave higher rates of growth -^r produced larger animals 



Fig. 3. Experiment 1. Worm-fed controls, at an age of 132 weeks. No. I, 

 female (total length, 200.8 mm.; weight, 57.0 gm.); No. 2, female (total length, 

 215.1 mm.; weight, 65.0 gm.); No. 3, male (total length, 212.0 mm.; weight, 

 55.0 gm.). 



than did earthworms. Finally it was decided to use beef liver as 

 food. The three worm-fed animals (Fig. 5) of Experiment 2 were 

 used for this experiment. The two larger animals, male No. 1 and 

 female No. 2, were fed liver, the smallest animal, male No. 3, was fed 



