150 



C. M. JACKSON 



On the whole, however, the grouping suffices to give a good 

 view of the results. Group I shows the organs with marked 

 growth tendency to be the skeleton, eyeballs, spinal cord, ali- 

 mentary canal, testes, hypophysis and suprarenal glands. Group 

 II, which approximately maintains constant weight, includes the 

 musculature, brain, heart, kidneys and liver. Group III, those 

 which fail to maintain their weight when the body-weight is held 

 constant, includes the integument, lungs, thyroid gland, ovaries, 

 spleen and thymus. 



In the same table 25 for convenience of comparison are also 

 grouped the various organs of the adult rat according to their 

 relative loss in weight during chronic inanition (Jackson '15 c). 



TABLE 25 



Comparison of groivth tendency in young rats held at constant body-weight from age of 

 three to ten weeks with tendency to maintenance in adult rats during chronic inani- 

 tion. The figures indicate the apparent average percentage gain or loss in absolute 

 weight during the period of experiment 



' Indicates correspondence between the groupings in young and adult series. 



