136 CALVIN P. STONE 



groove to the posterior wall of the frontal sinus. This served to 

 destroy the filaments of the olfactory nerve which enter the bulb, 

 coming from the nasal end-organs, through the cribiform plate, 

 and provided a safeguard against functioning of olfactory system 

 in the event that a small bundle of fibers of the tract was not 

 transected. Time was allowed for coagulation of the blood 

 coming from the ruptured arteries and veins; then all Coagulated 

 blood was removed by means of sterile cotton and the wound 

 was closed. The cut edges of the integument and superficial 

 fascia were brought together and sutured by interrupted stitches 

 and a thin cotton celloidin dressing was applied to the region of 

 the incision. 



b. Experimental results. Rat 22. Operated at age of thirty 

 days. Operation incomplete. Second operation age sixty-six 

 days. Successful. Tested at age of seventy-six days. Copu- 

 lated after eight minutes forty seconds exposure. Record for 

 first twelve minutes was eight copulations. Record of copula- 

 tions for thirty minutes at the age of eighty-one days was twenty- 

 one. Autopsy showed complete destruction of bulbs. 



Rat 23. Operated at age of thirty days. Operation not suc- 

 cessful. Operated at age of sixty-one days with complete aboli- 

 tion of smelling. Tested at age of seventy days for eight-minute 

 period. At time for second period female was no longer recep- 

 tive. No signs of sexual excitement in the first trial. Tested 

 at the age of seventy-five days. Copulated at end of fifty-five 

 seconds after female was placed in cage. Did not effect vaginal 

 entrance. No further attempts in six minutes. In second period 

 of six minutes no further copulations. At third period of ex- 

 posure, copulation full and complete was renewed at fourteen 

 minutes after female's return to the cage. Record for one half 

 hour was thirty copulations. Autopsy showed complete destruc- 

 tion of bulbs. 



Rat 24. Operated at age of thirty days. Incomplete destruc- 

 tion. Second operation at age of sixty-two days. Complete 

 abolition of smelling. Tested at age of seventy-one days for 

 periods of six minutes, eight minutes. No attempts at copula- 

 tion, although there was frequent mounting without definite 



