38 



.IAMKS KOUJN SLONAKKR 



danger of the other rats becoming infected this one was killed. 

 They can, however, I think be relied upon to the eleventh 

 month as it seemed perfectly normal in every respect. Whether 

 it would have reached a heavier weight than 200 grams can 

 not be predicted, but judging from the growth of the others I 

 feel convinced that it would have grown to a larger size had it 

 been in normal health. 



Weight in Grams 

 350 



Fig.14 



200 



Age in Months 5 



Figure 14. Curves representing the growth and decline of the control rats during 

 their lifetime. 



The curves representing growth show rhythmic fluctuations 

 somewhat similar to those seen in the curves of daily activity 

 in Fig. ii. These fluctuations in growth compare in a general 

 way with those of daily activity. In some cases they compare 

 directly in time and appearance. Only a few comparisons 

 will be made. At 13 months old there was a general increase 

 in daily activity (Fig. 11), also a general increase in weight 



