CHAPTER 8 

 GROWTH IN TERMS OF WATER AND SOLIDS 



1. In the body as a whole. 2. In the larger divisions of the body and the 

 organs. 3. In the brain and spinal cord. 4. Corrections. 



1. In the body as a whole. 2. In the larger divisions of the 

 body and the organs. Data on this head have been pubhshed 

 by Lowrey ('13) and are here presented. 



With the exception of one of the old rats the animals used 

 for table 158 were reared at the University of Missouri. 

 They were fed on chopped corn with a daily ration of bread soaked 

 in whole milk and once a week a small quantity of fresh beef 

 was given them. All were sound except some of the older animals 

 which suffered from infected lungs — but not to such a degree 

 as to affect their general nutrition of vigor. Table 158 is based 

 on table 1, Lowrey ('13). The data for the two sexes are com- 

 bined. In the original the range of the observations is given 

 and also the number of animals used in each instance. In the 

 present table the ranges are omitted and the number of animals 

 is given for the body weight (net) only. The other determina- 

 tions for the systems and organs were based on about the same 

 number of animals as were used for the body weight, except in 

 the case of testes where the numbers are about half as large. 

 The oldest anuiials were somewhat under one year of age. 



In table 158 the percentage data are given for the dry substance. 

 Here in table 159 they are transformed to the percentage of 

 water. 



To supplement table 159 the graphs in chart 50 show the 

 relations of the percentage of dry substance in the entire body and 

 its principal parts. 



The growth of dry substance is most marked during the active 

 growing period, from birth to 75-100 days. 



299 



