KIND OF FOOD 7 



very small amounts of animal food were present as compared to a large 

 quantity of vegetable food, I have called this a strictly vegetable diet, 

 at the same time realizing it is not absolutely such a diet. 



The amount of food given to each rat was not weighed, but meas- 

 ured as accurately as possible with a spoon, or by pieces of equal size. 



The following few days' diet taken at random will serve to show 

 the variety of food and its frequency. 



April 23. Cooked corn, lettuce, cracked corn and water. 



April 24. Water-soaked bread, almonds, lettuce, cracked corn and water. 



April 25. Baked beans, lettuce, cracked com and water. 



Omnivorous had also meat. 

 April 26. Graham muffins, almonds, cracked corn and water. 

 April 27. Water-soaked bread, lettuce, cracked corn and water. 

 April 28. Water-soaked bread, almonds, cracked corn and water. 

 April 29. Cracked corn and water. 

 April 30. Mashed potatoes, lettuce, cracked corn and water. 



Omnivorous had also meat. 

 April 31. Water-soaked bread, buckwheat cakes, cracked corn and water. 



Another example at another season of the year is as follows: 

 Nov. 14. Bread, cracked corn and water. 

 Nov. 15. Potatoes, macaroni, cracked corn and water. 



Omnivorous had also meat. 

 Nov. 16. Bread, oatmeal mush, cracked com and water. 



Omnivorous had also meat and bread hash. 

 Nov. 17. Water-soaked bread, cracked corn and water. 

 Nov. 18. Water-soaked bread, cracked corn and water. 



Omnivorous had also meat and bread hash. 



The amount of meat given to each of the omnivorous rats was 

 usually small, consisting of but a few grams. It was given on an aver- 

 age two or three times each week. 



We have thus sixteen rats as nearly alike in regard to age, parent- 

 age, size and tendencies as it is possible to obtain, subjected to the same 

 environments, fed the same food with the exception that the eight omni- 

 vorous feeders had a few grams of animal food added to their diet about 

 three times each week. It is obvious, therefore, that whatever differ- 

 ences may be found between these two groups of rats in regard to their 

 activity, rate of growth, and longevity must be due wholly to the pres- 

 ence and absence of animal food in the two diets. 



