DKATII AND ITW I)IS(il!ISKS. 441 



ut this lime upon llie color sense, Infumata was placed in one of the hoxes 

 ol' colored glass descrihed in a preceding chai)ter, and, at intervals of one 

 hour during the day, was moved from the section in which she had set- 

 tled to another. Every time this removal was made she fell stifHy on 

 her side, drawing her legs in and remaining thus for about three minutes. 

 In experiments with her afterwards, the Peckhams found that, when 

 knocked about on a table, she would stay in the position in which she 

 fell, although this was often an uncomfortable one. She showed no sign 

 of life when rolled about, but jumped up at the least prick of a needle. 

 She never remained (juiet for more than twenty-seven minutes, and never 

 absolutely motionless for so long a time as this, there being slight quiv- 

 ering movements of the legs and palps at intervals of three or four 

 minutes. ^ 



The Peckhams liad found no spider that would endure bad treatment 

 without showing signs of life, until they experimented on the Insular spi- 

 der. When put on a table, Insularis acted much as Infumata 

 pi er j^^^j done, but had no such rigid, lifeless appearance. When 

 she was knocked or touched with the point of a needle, there 

 was a convulsive twitch of the legs, though she seemed to be trying to 

 keep quiet. The fir.st time she was pricked so as to puncture the skin 

 she remained motionless. But at the second puncture she ran. After- 

 wards, from both males and females of this species, the observers obtained 

 similar results, once finding an individual that did not run until the skin 

 had been jjunctured five times. When the needle entered the skin, there 

 was usually a twitching of the legs, wliich seemed to show that sensation 

 was present. Outside of this species the Peckhams found no spider that 

 would endure a puncture of the skin without running away, and they 

 rarely found one that would keep quiet while being handled.^ 



Such a remarkable instinct as that of death feigning did not, of course, 

 escape the observation of such an incomparable naturalist as Darwin. He 

 tells us * that he carefully noted the simulated positions of sev- 

 „. euteen different kinds of insects, including among them a spider. 



These belonged to the most distinct genera, both poor and first 

 rate shanuners. He afterwards procured naturally dead specimens of some 

 of these insects, and others he killed with camphor by an easy, slow death. 

 The result was that in no one instance was the attitude exactly the same, 

 and in several instances the attitude of the feigners and the really dead 

 were as unlike as they possibly could be. 



The Peckhams in the course of their experiments received the impres- 

 sion that the habit of keeping still after dropping must not only help the 

 spider to avoid detection, but must also make it more certiiin of finding 



' Ibid., page 410. » Ibid., page 410. 



" Kpsay on Instinct, .\ppcndi.x to Mpntiil Evolution of .\ninials, )>y G. J. Romanes, 



page ',W.>. , 



