Nos. 455-45^'] HEARIXG AXD SMELL fX SPIDERS. 86 1 



except on the bottom. A small hole was left in the paper of 

 one side to admit li-ht and one in the top for observations. 

 The bottom was ot mosquito nettin,!^- which served to admit 

 the somid \va\-es hom below. The ca,<;-e, supported at the three 



the float in a stone jar filled with water and attached to it by 

 rubber bands. A layer of sawdust three inches thick isolated 

 the jar and stool upon which it stood from vibrations from 

 without. The apparatus, though placed in a quiet, darkened 

 corner of the laboratory, was used only when there were as 

 few outside disturbances as possible. 



a. Gcolycosa tcxana Montg. 



9 No. 13 was placed in the hearing cage and left unmolested 

 one hour. At the end of that time successive trials were made 

 \vith tuning forks of 128, 256, 320 and 512 vibrations, but no 

 fes})onse whatexer was obtained. At two later dates the 

 experiments were repeated but with no more definite results. 

 The same results were obtained with three other females, in 

 each case using all the tuning forks. Also a male, after 

 remaining quiet one hour in the hearing cage was tested with 

 all the forks but gave no response. 



intermission w 



as tested with the forks but ren: 



lained ])erfectly 



quiet. She v 



v-as left in the cage over night ; 









9 Xo. 6 wa. 



> testetl by three separate series 1 



of exi)eriment.s. 



the first after 



two intervals of an hour and the tl 



fird after a half 



hour had claps 





of the sounds. 



Inuring the fii 





ind legs in the 



normal w^v 



as if nothmg unusual were Ik 



il)pening. Xo 



responses wer 



•e obtained on similar exix-rmie 



nts with two 



other females 



and a male. 





At another time a steel bar which gave a pitch oi approxi- 



