104 



SHINKISHI HATAI 



200 250 300 350 400 450 



Chart 5 Showing the weight of spleen of the male albino rat according to 

 body weight. The observed weights are represented by 87 male rats. 

 # Observed weight. Calculated weight. 



infection, nevertheless when this was made as far as possible, 

 the resulting data were quite uniform as will be seen from the 

 chart. 



5. Spleen. The growth of the spleen in weight is represented 

 by the following fonnula: Weight of spleen = 



0.00245 Bd. wt. + 0.0301 log Bd. wt. - 0.025 



The constants of the formula were determined from 87 male 

 rats and the relation between observed and calculated values is 

 shown in chart 5. The weight of the spleen is highly variable 

 owing to a- great frequency of cases of 'enlarged' spleen. In 

 treating the records I have excluded all such plainly altered 

 spleens. Such enlarged spleens are usually darker in color, soft 

 to the touch, and exhibit all over the surface dark or grayish 

 patches. A slight acquaintance with this organ will remove any 

 difficulty in distinguishing the 'enlarged' from the normal spleen. 



