RATIO OF GROWTH 



^5 



The omnivorous were the reverse in all these respects. They were 

 strong, well nourished and supple. Their fur was soft and well kept. 

 Tail and nose were clean and smooth. They appeared full of vim and 

 energy, it being difficult to keep them quiet long enough to photograph. 

 The photographs, though showing a great difference, fail to show the 

 marked contrast one would see in a few minutes' observation of the 

 two groups. Such an observation would demonstrate the great differ- 

 ence in alertness and interest in surrounding objects, quickness and ease 

 of movement in response to external stimuli, voluntary movement and 

 vigor. The omnivorous appeared in the prime of life in all these 

 respects, but in the case of the vegetarians these qualities were mani- 

 fested as in extreme old age. 



Young 



At Maximum Weight 



.S 

 < 



Male Av. 



5q 



Fem. Av. 



.s 



4) 

 < 



At Death 



Male Av. 



C ay 



< 



Fem. Av. 



bo 



^& 



Dmnivorous 

 Exercised 

 Rats 



Vegetarian 

 Exercised 

 Rats 



Omnivorous 

 Control 

 Rats 



Vegetarian 

 Control 

 Rats 



42 



43 

 37 

 39 



36 

 42 

 40 

 36 



34 

 45 

 39 

 45 



37 



47 

 42 



42 



41 



36 



41 



44 



37 



39 



39 



37 



252 

 272 

 176 

 261 



145 

 no 

 129 

 132 



310 



331 

 200 



319 

 164 



185 

 209 

 191 



544 

 497 

 509 

 560 



544 

 253 

 251 

 509 



392 

 392 

 337 

 390 



392 

 283 



390 

 353. 



262 



534 



176 



145 



544 



124 



320 



391 



200 



164 



195 



342 



509 



338 



337 



392 



214 

 206 

 128 

 215 

 96 



97 

 100 



84 



* 



247 

 165 

 135 

 172 



150 

 163 

 117 

 107 



746 



925 

 1014 



785 



685 

 381 

 463 

 682 



1074 

 1361 

 360! 

 1232 



778 

 373 

 578 

 500 



212 



96 



241 



129 



819 



685 



1222 



484 



128 



94 



135 



150 



Table X. — Showing the difference between the omnivorous and vegetarian 

 rats in regard to the age and weight at the beginning of the experiment, the prime 

 of life, and the death of each individual. 



* This weight was taken 14 days before death and is therefore heavier than 

 it should be. 



fThis rat was killed because of sickness. 



IOI4 



508 



360 



778 



