TRANSMUTABLE. 103 



attainment of their maximum power, and their 

 duration of life; but in birds this relation seems 

 to be entirely set aside; and is it not because 

 a rapid attainment of their full power is essential 

 to their existence?" Dr. John Davy, on the 

 "Growth of Birds," Edinburgh New Philosophical 

 Journal, April, 1860, p. 262. 



