12 



EFFECT OF DIET ON THE ALBINO RAT 



omnivorous and vegetarian feeders grows rapidly less and less. The 

 same may be said regarding the amount of daily activity of the two 

 classes. The omnivorous female far surpasses all others. The omni- 

 vorous male comes next in order. Then follows the vegetarian female, 



RevoIutiaM 



14000 

 13000 







, 















13000 

















11000 





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10000 





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SOOO 





t '"•'' 



«f ', 





-— 









8000 





j 







« 







7000 





1 





V 



\ .-•. 







MOO 













\ 







6000 











\ 







4000 



li 





\ A 





\ 







Mm 



A /I 





v/\ 





""" 







3000 



i\j 



\ 



■■ 



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\ 



V / '\ 



leoo 



If SI 



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^^"^N 



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\ 





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VF 



V 



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A«eui Months SfBJff'aO 26 3D 35 



Fig. II. Curves representing the average daily activity of each sex of the exercised 



rats at the ages indicated. The heavy solid line (OM) is the omnivorous 



males, the heavy dotted line (OF) is of the omnivorous females. The 



light solid line (VM) is the vegetarian males. The light 



dotted line (VF) is the vegetarian females. 



closely followed by the vegetarian male. The females of each class thus 

 surpass the males of the same group in average daily activity. 



When we consider the time in life at which these rats do the great- 

 est amount of daily running we see, on consulting the curves of Figure 

 II, that it occurs in both classes at an early age in life, usually between 

 the seventh and twelfth month. In the omnivorous feeders it is a little 

 later than in the vegetarians. In a former experiment^ it was ascer- 

 tained that the greatest average daily run of the normal male and female 

 occurred when they had reached a trifle more than one-third of their 



