362 THE STORY OF A BIRD LQVER 



which are not anticipated, is one of the greatest 

 inducements for continued observation in any 

 given field. While I am not sure in my mind of 

 any specific reason for keeping certain birds, 

 notably macaws, in captivity, I feel assured that 

 the connection and the probability of events is 

 greater ornithologically between macaws and the 

 work of the ornithologist than is relationship be- 

 tween astronomy and migration. 

 ' Zoological study and investigation while car- 

 ried on in many lines, has, up to the present time, 

 consisted chiefly of three distinct kinds of work. 

 Of these, the very fundamental matter of classifi- 

 cation, which may be termed systematic work, is 

 paramount. This includes, besides giving the 

 names to the different forms of animal life and 

 describing them, the grouping together of those 

 related in aggregates known as genera, families, 

 and orders. The second line of development in 

 zoological research has been what may be termed 

 morphological. It is true that systematic work 

 deals somewhat with morphology, especially the 

 obvious and external morphology ; but the term 

 morphology is largely associated with the investi- 

 gation of the structure and appearance of the 

 internal mechanism of animals. The third avenue 

 of work is known as physiology, dealing with 

 function, that is, what the various parts of the 

 animal mechanism do in the economy of life. 



