864 THE AMERICAX XArCRALIST. [Vol. XXXVIII. 



b. Observations on Individnals loith Palps extracted. 



It next seemed desirable to determine the location of the 

 olfactory sense, and for this purpose the oils that produce defi- 

 nite results with the unmutilated individuals were used exclu- 

 sively. 



Both palps were extracted with forceps at the femoro-tro- 

 chanteral joint from twelve females and six males, and after a 

 week had elapsed experiments were made with three non-irri- 

 tatiii-- oils, kucndcr, wintergreen and bergamot. 



Lavcndcr.-^ In every case the spider gave definite responses 

 to the stimulus. W hen the drop of oil was held directly beneath 

 each leg successively, each responded by a slight, quick, upward 

 jerk. Almost without exception the first pair were raised 

 highest and held poised in the air several moments or until the 

 other legs were stimulated. The second pair were not raised so 

 high as the first, nor the third pair so high as the second, and 

 rarely ever both at the same time. The fourth pair were usu- 

 ally raised only a little distance and then drawn up closer to the 

 body while the si)ider moved away. 



// ntit roTcni. ^- The same specimens, twelve females and six 

 males, were used and practically the same results were obtained. 



lH-r.^auiot.~~ A similar series of experiments was performed 

 "H the twelve females and responses corresponding to the 

 al)()\ e were gi\-en, though bergamot appears to offer a weaker 

 stimulus tiian the other two oils used. 



\yA\\)^ were extracted from twelve other males 

 anc SIX other females and experiments were performed after 

 \\cnt\-loui hours. In only one instance did the spider fail to 

 'vspond. all others showing the usual reactions — the first pair 

 "1 responding most definitely and the others less so. The 

 M>H er. usually turned away after a few applications of the 



First Pair of Legs Removed. 



In five females and .six males the palps were left intact but 

 the first pair of legs were similarly removed with forceps. The 



