Turner, Notes Upon the Gallery Spider. 105 



near the top of the bottle. In all cases the gallery was against 

 the side of the bottle, and penetrated from below. These 

 spiders were now placed in a large box in which had been ar- 

 ranged facilities for constructing webs of any shape or size. 

 The majority of the spiders died. Of the survivors, some built 

 triangular webs, some built rectangular webs, others built irreg- 

 ular webs. Some of the webs were horizontal, some inclined. 

 In some the gallery was in one position, in others the gallery 

 was in a quite different position. 



Example XXIX. — Another lot of spiders was collected, 

 care being taken not to collect any spiders that were residing in 

 quadrangular webs. Tbese were isolated in cylidrical bottles 

 and left several days. The survivors constructed circular webs. 

 They were now placed in the box used in the last experiment. 

 Many died. The survivors constructed webs. A few of these 

 webs were rectangular. Here, then, we have a case where the 

 same individual successively constructed three differently shaped 

 webs. This experiment has been repeated several times. 

 Whenever the spider survived the ordeal the result was the same 

 as here. 



I now come to an experiment of a different sort. 



Example XXX. — In the angle between a projecting win- 

 dow-sill and the wall of the room, a spider had constructed a 

 large triangular web. The gallery and a small portion of the 

 main sheet were on the window-sill. With a broom I demol- 

 ished that portion of the web which projected beyond the sill. 

 During the night the spider reconstructed the web. The web 

 was again destroyed, with the same result. This was repeated 

 four times. But the fifth time, although the spider began to re- 

 construct the web, it only extended the structure a short distance 

 beyond the sill. Was this variation a mere chance, or did the 

 spider realize that there was danger beyond this sill and act 

 accordingly ? This is an isolated example. 



Ex.\MPLE XXXI. — A tear was made in the free border of 

 a triangular web. The spider patched the web. 



Example XXXII. — A large hole was made in a triangular 

 web. The hole was situated near the free border of the web. 

 During the night, the web was patched. In some unknown 

 way the hole had been increased until it divided the free border 



