2-tO 



With spiders, the mother's care is devoted chiefly 

 to furnishing j^rotection to her helpless eggs. 

 These are placed in silken sacs, which are often 

 very elaborate in construction and protected with 

 great care. 



The most connnon egg-sacs are those found 

 in the fields attached to stones and pieces of 

 wood (Fig. 131). They are disk-shaped objects, 



silvery in color, and about the size of an old-fashioned three cent 



piece. 



181. — Eyg-sac of a 

 spider. 



f! 



/ 



182. — E(jg-sac of an orb iceaver 



The egg-sacs of the cobwel) weavers can be found suspended in 

 their webs ; and those of the orb weavers in various situations. 

 Figure 132 represents the large egg-sac of one of the orb weavers. 



340 



