174 



John B. Calhoun 



wounds on associates. Their lesser degree of scar tissue contributed to a 

 reduction in the mean scar tissue index for high-velocity males. 



Weights of adrenals, kidneys, and heart all tend to increase as velocity 

 increases. Despite lack of histological studies, what I suspect has happened 

 is that as velocity drops as animals withdraw from social interaction, organ 

 size decreases in accordance with decreased demands made upon them. 



20 30 40 



VELOCITY 



Fig. 40. Some major characteristics of rats affected In-^ conditions that determine 

 velocity. 



Fig. 40(B) simply shows the product of the weight of these three differ- 

 ent organs. 



Most sensitive to velocity and easy to measure is fat. Fig. 40(C). Fat here 

 represents those abdominal deposits most easily removed: the dorsal 

 lumbar-sacral deposit, that in the genital mesentery, and those in the 

 mesenteries of the gut. Though these deposits are rarely as large among 

 males as for females, it is nevertheless quite clear that as rats slow down 

 by social withdrawal they exhibit greater propensities for converting food- 

 stuffs into fat. 



