PREFACE TO THE FIRST EDITION ix 



out imbued with the influence of my beloved master, Michael 

 Foster; and on various hygienic topics I have to acknowledge a 

 special indebtedness to the excellent series entitled Health Primers. 



The majority of the anatomical illustrations are from Henle's 

 Anatomie des Menschen, and a few from Arendt's Schulatlas, the 

 publishers of each furnishing electrotypes. A considerable num- 

 ber, mainly histological, 'are from Quain's Anatomy, and a few 

 figures are after Bernstein, Carpenter, Frey, Haeckel, Helmholtz, 

 Huxley, McKendrick, and Wundt. About thirty, chiefly diagram- 

 matic, were drawn specially for the work. 



Quantities are throughout expressed first on the metric system, 

 their approximate equivalents in American weights and measures 

 being added in brackets. 



H. NEWELL MARTIN. 



BALTIMORE, October, 1880. 



