Date of Award


Degree Type

Bachelors Essay

Degree Name

Bachelor of Science (BS)


Biological Sciences

First Advisor

James C. Perry

Second Advisor

W.J. Keegan


The respiratory mechanisms of birds, unlike that of mammals, are definitely adapted to the function of flight. Because of this added adaptation, we should expect, therefore, some morphological and perhaps even embryological, physiological, and histological differences. An example of a morphological difference between birds and mammals is the intricate system of air-sacs that are present in birds. This remarkable feature is probably the reason why birds are able to fly as they do.

In this thesis the writer has used the sparrow (Passer domesticus) for the basis of his experiments. This particular bird was chosen in preference to all other birds because very little work has been done on it, that is, in reference to the organization of the material concerning the respiratory system, such as 1 its gross anatomy, embryology, histology, physiology, etc.


A Thesis submitted to the Faculty of the College of Liberal Arts of Marquette University in Partial Fulfillment of the Requirements for the Degree of Bachelor of Science