SEXUAL BEHAVIOR OF ALBINO RAT 135 



made ready for action by the influence of internal secretions from 

 the reproductive glands. He wrote as follows: 



In bezug auf die Geschlechtsfunktionen kann man genau verfolgen, 

 dasz sich die Wirkungen zunachst auf das Gehirn konzentrieren. Die 

 Ganglien werden instand gesetzt, die vom Weibchen ausgehenden 

 Sinneseindriicke (bie den Ratten sind es namentlich Geruchseindriicke) 

 in Lustgefiihle umzuwerten. Es entsteht das, was man heftigen Trieb 

 sum Weibchen oder starke geschlechtliche Aufregung nennt. 



In a similar tone von Bechtrew (211, vol. I, p. 395) writes of the 

 r61e of smell: "Im engsten Zusammenhang mit den Geschlects- 

 funktionen steht der Geruchsinn, vor allem in der Tierwelt. 

 Bei vielen Tieren spielt ferner der Geschlecksinn die Rolle eines 

 machtigen Erregers des Sexualtriebes." 



a. Operative technique. A mid-sagittal incision was made 

 in the scalp from points midway between the ears and the eyes. 

 On either side of the incision the skin was retracted thus lay- 

 ing bare the skull. The skull plate was trephined lateral to the 

 mid-line at sufficient distance to avoid rupture of the superior 

 sagittal sinus beneath. With bone forceps a small triangular 

 piece of bone, marked off by the trephine openings, was removed. 

 This opening was just large enough to permit of the insertion 

 of an instrument approximately one and one half millimeters 

 wide. The removal of the small piece of skull plate left exposed 

 the dura mater over the posterior part of the olfactory bulb 

 and the anterior portion of the frontal lobe. Special care in 

 cutting through the meninges was exercised in order to avoid 

 rupture of the superior sagittal sinus. With this small opera- 

 tive field it is usually impossible to sever the olfactory bulb 

 from the frontal pole without rupturing the anterior cerebral 

 arteries as they swing around the frontal poles. The bulb was cut 

 from the brain by introducing a small cautery into the opening 

 of the skull and thrusting it downward to the base of the 

 skull, thence moving it sufficiently both medialward and lat- 

 eralward to effect complete transection of the bulb just ante- 

 rior to the frontal lobe. Without removal the cautery was then 

 so manipulated that the tip moved forward in the ethmoidal 



