1. The Social Use of Space 



169 



just before the third set of velocity estimations due to injections of a mon- 

 amine oxidase inhibitor (Catron), which substance had no influence on 

 the velocity of survivors. Thus, for a few individuals, v is based on the mean 

 of only two estimates of velocity for the 13th and loth months. 

 ■ These estimates of velocity are shown as data in Fig. 38. Approximate 

 regression lines were fitted by eye through these points for both lA and 

 2A. Velocities of lA males are markedly lower than those for 2A males. 

 According to the general formulation of velocity, one would anticipate 

 that males in lA had been exposed to many more social restraints or sanc- 

 tions in the form of aggressive actions from associates. This, in fact, was 



10 20 



VELOCITY RANK 



Fig. 38. Velocity, velocity-rank relationships among male rats in a closed society. 



the case as is reflected by the amount of scar tissue developed over the 

 lumbar-sacral area from wounds received in fighting. On the basis of a 5- 

 point rating scale (0 = none, 5 = most) , the mean scar tissue index for 

 lA and 2A males was, respectively, 3.24 and 2.49. 



The lowered intensity of fighting by 2A males was associated with a 

 higher vitamin A content of their diet. Both lA and 2 A rats were given an 

 dentical synthetic diet except for vitamin A. lA rats received 3 interna- 

 tional units per gram of diet, a high normal level in comparison to natural 

 foods. However, the 2A rats were given 1 2 international units per gram of 

 diet, a level comparable to that given to humans in high potency vitamin 

 pills. Although it is outside the objectives of the present discourse to detail 



