A COURSE 



OF 



ELEMENTARY 



PRACTICAL PHYSIOLOGY 

 AND HISTOLOGY, 



BY 



M. FOSTER, M.D, FH.S., 



PROFESSOR OF PHYSIOLOGY IN THE UNIVERSITY OF CAMBRIDGE. 



AND 



J. N. LANGLEY, MA, F.R.S., 



FELLOW OF TRINITY COLLEGE, CAMBRIDGE. 



SIXTH EDITION. 



Hon&on : 

 MACMILLAN AND CO. 



AND NEW YORK. 



ISSN 



[77/< ni'jlit <>f Triinxldtion is resen-f/.] 



