1911.] NATURAL SCIENCES OF PHILADELPHIA. 403 



spiders were left undisturbed in the cases over night. The next 

 morning if they were perfectly quiet a vial of oil was placed directly 

 beneath and within one centimetre of each individual. Time was 

 counted in seconds. An intermission of forty-five minutes elapsed 

 between any two tests of various odors. The following are the average 

 results of the tests for four or five days with the above five oils. 



Clove. — Most specimens moved away slowly; a few moved away 

 quickly; some moved only slightly; several worked palps, chelicera 

 and legs; one rubbed palps and two threw up front legs quickly. 

 Time ranged from 3 to 90 sec. with an average of 27 sec. for L. lepida; 

 for Phidippus from 3 to 32 sec. with an average of 13 sec. Forty-one 

 specimens were used. 



Thyme. — Almost one-half moved away slowly; the same number 

 away quickly: the remainder either raised up quickly, threw up front 

 legs, worked palps and chelicera or rubbed their legs together. Time 

 for L. lepida 2 to 95 sec. with an average of 10 sec. ; for Phidippus 2 to 

 15 sec. with an average of 4 sec. Forty-two specimens were used. 



Wintergreen. — The majority moved away slowly; several away 

 quickly: several arose quickly; a few worked palps, chelicera and 

 legs ; one lay down over the odor, and one rubbed legs together. Time 

 for L. lepida 2 to 89 sec. with an average of 11 sec; for Phidippus 3 

 to 15 sec. with an average of 7 sec. Forty-eight specimens were 

 employed. 



Peppermint. — All either moved away quickly or arose quickly and 

 then moved away slowly; some of these after moving away worked 

 palps, chelicera and legs: three threw up front legs; one lifted feet 

 high; one rubbed legs and chelicera together. Time for L. lepida 

 2 to 13 sec. with an average of 6 sec. ; for Phidippus 2 to 7 sec. with an 

 average of 3 sec. Forty-eight individuals were used. 



Bergamot. — The majority moved away slowly; the remainder 

 either raised up quickly or moved away quickly; only a few worked 

 palps, chelicera and legs. Time for L. lepida 3 to 45 sec. with an 

 average of 14 sec. ; for Phidippus 3 to 35 sec. with an average of 6 sec. 

 Forty-one specimens were employed. 



The total average of the results for the five oils is 13 seconds for 

 L. lepida and for Phidippus it is 7 seconds. 



Xow, since it may be contended that the results obtained by using 

 the above oils are due to an irritation of the skin rather than due to an 

 olfactory sense, I also used the following which cannot be classed as 

 irritants: 



Buttercup (Ranunculus sp.). — Both the fresh and decayed flowers 

 were employed, and there was practically no difference either in time 



