INTRODUCTION, e383 
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 have 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 really 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.” 
