INTBODUCTION. I33 



ducing to notice any new bird, to refer to the resemblances in 

 appearance or to the affinity which it may possess with some or 

 other of the species and groups to which the student's attention 

 has been called. 



We may now pass on to the next subject we hare to consider, 

 the Organization of Birds. Before, however, entering upon the 

 question what part any organ or organism can play, it is 

 necessary to have some notion of what such organ or organism 

 in itself reaUy is. A study of "Structure," or "Morphology," 

 should always precede a study of what any structures, or the 

 whole organism they compose, can do. This latter inquiry 

 constitutes the study of " functions," or " Physiology." 



