Watson, Weight of the Nervous System. 



521 



Mated : 



Average brain weight. 



Group A (2 rats) 1.8 152 gr 



" B (I rat ) 1.7740 gr 



" C (I rat) 1. 8108 gr 



" D (2 rats) 1.8443 gr 



" E (2 rats) 1.9820 gr 



Average (8 rats) 1.8585 gr 



Brain Weight. 



Unmated : 

 Average brain weight. 

 (2 rats) 1. 746 1 gr. 

 (2 rats) 1.7974 gr. 

 (2 rats) 1.7972 gr. 

 (l rat ) 1.81.26 gr. 

 (3 rats) 1.9576 gr. 

 (10 rats) 1.8397 gr. 



*The two mated females in Group A were not as healthy as the other rats 

 used in this experiment. After giving birth to their young, sores nearly 

 always appeared on their necks. These grew steadily worse until the young 

 were removed. After removal of the young, the sores would heal over complete- 

 ly, only to reappear at the next period of lactation. 



