106 



SHINKISHI HATAI 



35 



25 



1.5 



100 



150 200 250 300 350 400 450 



Chart 7 Showing the weight of testes of the male albino rat according to 

 body weight. The observed weights are represented by 121 male rats. 

 • Observed weight. Calculated weight. 



be associated mainly with the. infected lungs. It is quite safe 

 to conclude that the alimentary tract is more or less altered in 

 cases where pulmonary infection is well advanced. This means 

 that nearly 90 per cent of adult rats are unfitted for this deter- 

 mination. The alteration in question causes a loss of weight. 

 The present formula was determined from the rats in apparently 

 good health and thus practically free from this infection. Con- 

 sequently the upper end of the graph will naturally be higher 

 than when based on the values obtained from a random sampling 

 of the general population without regard to the condition of the 

 alimentary tract. 



7. Testes. Owing to dissimilar rates of growth during the 

 earlier days of life, the graph illustrating the growth of the testes 

 has three distinct phases. The first phase however occupies 

 such a brief interval (5 to 10 grams in body weight) that it was 

 thought, from a practical standpoint, not worth while to work 



