206 NATURE'S TEACHINGS. 



Even in those cases where this mode of travelling would be 

 too perilous on account of the rapid torrent, the Ants contrive 

 to suspend themselves in long strings until they effect a com- 

 munication with the trees of the opposite bank. 



It is, perhaps, needless to give more than a passing reference 

 to the Suspension-bridges made by Spiders, by means of which 

 they can traverse considerable distances. The similar bridge 

 of the Little Ermine Caterpillar has already been mentioned, 

 when treating of the subject of Double Walls. 



