I^Phy 



K 



THE RESPIRATORY EXCHANGE 



OF 



ANIMALS AND MAN 



BY 



AUGUST KROGH, Pn.D. 



READER IN ZOOPHYSIOLOGY, UNIVERSITY OF COPENHAGEN 



WITH DIAGRAMS 



LONGMANS, GREEN AND CO. 



39 PATERNOSTER ROW, LONDON 



FOURTH AVENUE & 30TH STREET, NEW YORK 



BOMBAY, CALCUTTA, AND MADRAS 



1916 



