METHODS OF DEFENCE. 79 



When they are at last assured that there is really 

 nothing to fear, the rest follow. 



Thus by the most varied methods animals en- 

 deavour to save their threatened lives, and succeed to 

 some extent in attaining safety. Destruction and the 

 chase on one side, conservation and flight on the 

 other: these are the two chief acts which occupy 

 living beings. Many, however, less threatened, succeed 

 in perfecting their manner of life, and employ their 

 industry in less pressing occupations than eating 

 others or preventing others from eating them. 



