108 



ZOOLOCY 



no spiral is laid clown; (3) the outer spiral, the main part of 

 the spiral framework; (4) the foundation space, bej'ond the 

 spiral hues, and at the outer margin of the web (Fig. 111). 

 No study is more interesting than that of the details of 



Fig. 109o. — Web of Liiiyphia, one of the cobweb tspinners, in a spruce tree. 

 Photo, by Enierton. 



construction of these parts of the spider-web, while they are 

 being made otit of doors or in large glass jars. 



The web of the orb-weaver has undergone, indifferent species, 

 very striking modifications. Thus, in some cases only frag- 

 ments, as it were, of an orb are l)uilt (Fig. 112). In one case 

 the spider lives in a recess behind the web and keeps in touch 

 with the web by means of a line running to its centre. By pull- 

 ing upon this line the centre is drawn back towards the 



