life, when brought into the sunshine, or before a 

 fire. 



But that the chief part of each species migrate, is 

 so well established by a multitude of corresponding 

 facts, that it seems almost an absurdity to doubt of 

 it. In the first place I would observe, that if these 

 birds lay concealed in winter, in the same countries 

 which they inhabit in summer, they would proba- 

 bly make their first appearance in spring, in mild 

 weather, and would appear sooner in early than in 

 late seasons, which is quite contrary to experience. 

 For several years past have I observed that chim- 

 ney swallows have appeared first in cold weather. 

 I have sometimes seen them as early as April the 

 2d, when the mercury in the thermometer has been 

 below the freezing point. On the other hand, I 

 have often taken notice, that during a continuance 

 of mild weather for the space of a fortnight, in the 

 month of April, not so much as one swallow has 

 appeared. 



It is a well known fact, that the swallow, like 

 most other birds of passage, appears earlier and de- 

 parts later in the southern than in the northern parts 



