26 



EFFECT OF DIET ON THE ALBINO RAT 



LENGTH OF LIFE. 



The various tables and curves so far given show in a general way 

 the comparative length of life of these two groups of animals. A more 

 detailed comparison will be necessary. 



In Table X the age of the death of each rat is giveil, also the 

 average age of each sex comprising the various groups. When the 

 same sex is compared it is noticed that the omnivorous feeders surpass 

 the vegetarians in longevity by a good margin. The only exception was 

 No. II, which should not be used in these comparisons as it was killed 

 on account of sickness. When the averages are compared the contrast 





oe 



*c 



W%gM 200 400 COO CW- 1WV "^ ■ 



Fig. i8. Diagram representing the average age of each sex of the four groups. OE 



omnivorous exercised; VE, vegetarian exercised; OC, omnivorous controls; 



VC, vegetarian controls. M and F refer to male and female. 



is still more pronounced. These averages are put in diagramatic form 

 in Figure i8. The horizontal lines represent the average age at death 

 of each sex in the different divisions. 



OE, VE, OC and VC refer to omnivorous exercised, vegetarian 

 exercised, omnivorous control, and the vegetarian rats, respectively. 

 The relatively short duration of life of the vegetarians is very conspic- 

 uous. 



If the average lifetime of all the omnivorous males is compared 

 with the average of all the vegetarian males, we find a ratio of 1020 

 days to 534 days; or 1.91 : i. When the females are similarly com- 



o = 



v__ 



Days WO iOO" ' 600 800 1000 1200 



Fig. IQ. Diagram showing the average lifetime of all the omnivorous rats (O) and 



all the vegetarians (V). 



*This rat was killed at this age because of illness. 



