FORM ULAS 



275 



25 



50 50 100 



200 



300 



4.0 



3.5 

 3.0 



20 



1.0 

 Q5 

 0.0 



Chart 49 — no. 21. Showing the changes in the relative percentage weights of 

 the epididymides — based on the data in table 156. x x, males ; o o, 



females. 



the organ into full function: that the relatively heavy viscera 

 depend for their high weight mainly on the liver and intestines, 

 and that the relative percentage weights of the blood and the 

 endocrine glands are similar, suggesting that although the relative 

 weight of the blood diminishes, its relations to the organs con- 

 tributing to it are maintained. These changes in the organ 

 composition of the rat require attention when interpreting its 

 physiological responses. 



11. Yalue8 for other characters linked ivith age. Table 157 

 contains the data for the ''standard" body weight on age, for the 

 weight of the brain and of the spinal cord and the percentages 

 of water in them. 



12. For7nulas. Formulas have been devised mainly by Dr. 

 Hatai for computing the length or weight of the body and of its 

 several parts, systems or organs, also for expressing the values of 

 other characters. 



Three incidental formulas (1) (2) (3) have been given in the 

 preceding pages. 



Of the remaining formulas for the Albino — Group I — are 

 given first, then those for the Norway — Group II. In Group I 

 there are two divisions. 



