THE 



MAMMARY APPARATUS 

 OF THE MAMMALIA 



IN THE LIGHT OF ONTOGENESIS AND 

 PHYLOGENESIS 



BY 



ERNST BRESSLAU, M.D. 



LATE PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF STRASSBURG 



WITH A NOTE BY 



JAMES P. HILL, D.Sc, F.R.S. 



JODRELL PROFESSOR OF ZOOLOGY, UNIVERSITY OF LONDON 



WITH 47 ILLUSTRATIONS 



METHUEN & CO. LTD, 



36 ESSEX STREET W.C. 



LONDON 



