SPIDER-WEBS. 101 



and cannot extricate itself until the spider can seize it. After 

 awhile the globules become dry, refuse to perform their office, 

 and then the spider has to construct another web. So numerous 

 are these globules that, according to Mr. BlackwalTs calculations, 

 an ordinary net contains between eighty and ninety thousand. 

 Below the figure of the web itself are shown the two kinds of 

 thread, the upper bearing the globules, and the lower repre- 

 senting one of the plain radiating threads. 



