6 Ada Springer 



The weights show that where an individual approaches the 

 minimum weight there is a decrease in percentage of loss. In 

 Set B^ during the first half of the period, eight weeks, the rate 

 of loss was 41 per cent, while during the last half, or nine weeks, 

 the rate of loss was 35.2 per cent. 



IV EFFECTS OF VARYING AMOUNTS OF FOOD 



Percentage increment, or rate of growth, is directly proportionate 

 to the amount of substance taken into the [body. This is shown 

 to be true by a comparison of the following sets. Sets C^ and 

 O (Table III), consisting of six individuals respectively, were fed 

 on the average 102 mg. of beef a week; Sets A^ and A^ (Table I), 

 consisting of six individuals also, were fed 153 mg. of beef a week. 

 After a period of nine weeks the percentage increments were as 

 follows : 



Set Ci 18.4 



. Set C2 145 



Average of the two sets 16.4 per cent 



Set Ai 23-3 



SetA2 29-8 



Average of the two sets 26 . 5 per cent 



After the ninth week, December i8, the individuals of Set C* 

 were fed 153 mg. of beef a week, while those in Set O were, as 

 before, fed 102 mg. a week. After another period of nine weeks 

 the relations were as follows: 



Increment 

 per cent 



Set C» 34-9 



Set C2 91 



This would seem to show that 102 mg. of beef per week was not 

 the maximum amount of food which could be assimilated by 

 the digestive tract. 



After a period of eighteen weeks Set A^ had gained 44.2 per 

 cent of the original weight, while O had gained but 23 .5 per cent. 



Comparing Set A^ (Table I), in which the animals were fed 

 153 mg. of beef a week, and Set B^ (Table II), in which the 



