9 



paradoxus, duck billed platypus, that peculiar egg-laying 

 mammal of Australia, as the connecting link between aves and 

 Tnammalia. 



Regarding the migration of birds, its cause and effect, much 

 controversy annually takes place without very definite solutions 



DKNDRAGAPUS CANADENSIS. 

 (Canada Grouse or Spruce Partridge). Male. 



being given to that problem ; consequently, I shall only explain 

 the peculiar migration habits of the three orders, and show a 

 few simple reasons for such, also showing that food and tempera- 

 ture, while to some extent responsible, cannot be held account- 

 able for all migration. 



