150 ELEMENTS OF BIOLOGY. 



their means of vision to this property. If this be the case, 

 v/e have here one of the most wonderful adaptations in the 

 whole range of animated nature, by which life is rendered 

 possible amidst the most apparently hostile conditions. 

 Good authorities, however, are indisposed to accept this 

 view, and some other explanation of the facts may yet be 

 found. 



