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PRACTICAL ZOOLOGY 



this way a thread is formed, which, soon being seized by the 

 wind, is drawn out longer and longer, blown hither and thither, 

 and thrown into tangles, so that finally a small raft is produced. 

 At last the wind lifts both the raft and its maker up into the air, 

 and the aerial journey begins. Perchance the little ship will be 

 stranded agreeably to the wish of its navigator in some spot 



FIG. 62. A, crab-spider; B, jumping-spider ; C, young spider preparing for an 

 aerial voyage ; D, house-spider. (After Emerton.) 



where the latter may enjoy its winter rest in security, in order 

 in the following year to spread its species (Fig. 62, C) (Schmeil). 

 Water Spider. The water spider of Europe lives under 

 water. Its abdomen has a velvety covering of hairs, and just 

 as a layer of air remains adherent to a velvet rag dipped in water, 

 so this spider always carries a large silvery air bubble down with 

 it below the water. There it spins a. dwelling not unlike a small 



