OUTLINES 



OF 



COMPARATIVE ANATOMY 



AND 



MEDICAL ZOOLOGY. 



BY 



HARRISON ALLEN, M.D., 



WOFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMT IN THB CXIVEBSITI Of PENNSYLVANIA 



i"'l 



SECOND EDITION. 



PHILADELPHIA: 



J. B. LIPPINCOTT & CO. 



1874. 



