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peared so anxious for their food as did the animals on the other diets. 

 The time required for regeneration of blood by this set of fat-fed animals 

 was 9 days, not longer than for the protein-fed rats (table 7). 



Carbohydrate only. Two grams of cornstarch, made in the form of 

 a paste with water to prevent scattering, were fed daily to each of three 

 rats after they had been bled. These animals required 12 days for 



TABLE 6 



Blood regeneration in adult rats after a single hemorrhage on a protein diet 



2 grams casein per day 



TABLE 7 



Blood regeneration in adult rats after a single hemorrhage; on a diet of butter fat only 



2 grams per day 



complete regeneration. This is somewhat longer than for those on the 

 protein diet, in agreement with the work on dogs receiving a carbohy- 

 drate-rich diet (11) (table 8). 



Protein-free food. This food was made up after the formula for the 

 standard diet with the casein replaced by corn starch, making a food 

 containing 68.5 per cent corn starch, 18 per cent lard, 9.0 per cent 

 butter and 4.5 per cent salts. Three animals were given 5 grams of 



