AMERICAN SCIENCE SERIES ADVANCED COURSE 



THE HUMAN BODY 



AN ACCOUNT OF ITS STRUCTURE AND ACTIVITIES 

 AND THE CONDITIONS OF ITS HEALTHY WORKING 



BY 



H. NEWELL MARTIN, D.Sc., M.A., M.D., F.R.S. 



Professor of Biology in tlie Johns Hopkins University ; Fellow 



of University College, London; Late Fellow of 



Christ's College, Cambridge 



SIXTH EDITION. REVISED 



NEW YORK 

 HENRY HOLT AND COMPANY 



1890 



