ORGANS OF BREATHING. 55 



would, if not provided with additional means of keeping itself 

 warm, often perish from cold ; but having, as we have 

 observed, a power of filling up the space between its flesh and 

 outward skin with air, it is thus furnished with a light, but 

 at the same time admirable coat, which effectually prevents 

 it from feeling the effects of cold, however severe. 



