142 



PHYSIOLOGY 



7. Respiration. Macleod ('07) has determined the C0 2 output 

 at 30C. for rats of about 170 grams in body weight, table 95. 



Cramer ('08) has made corresponding observations on rats 

 of from 40-60 grams in body weight, table 96. 



TABLE 94 



Mean = 11.81 0.030 



<r = 1.82 0.021 



r xy = 0.38 0.014 



?7 Zy = 0.48 0.013 



*? 2 xy - fxV = 0.094 0.0096 



8. Metabolism. Percentage of glycogen in the liver. Normal 

 young albino rats of about the same size (75 grams) were kept 

 on a diet of bread and milk and the percentage of glycogen in the 

 liver determined by the method of Pfliiger, (Cramer and Loch- 

 head, '13) table 97. 



Further observations showed that the glycogen content was 

 relatively high 3-5 hours after a meal, but after 15 hours fell so 



