vi PREFACE 



(even the cost of a useful microscope need not exceed 

 that there can be no excuse for neglecting such practical 

 studies. It is very difficult, if not impossible, for the young 

 to understand, for instance, the structure and working of 

 the heart unless they actually see one ; and so with many 

 other parts of the subject. Even the things which can be 

 learnt without actual observation are learnt far more quickly 

 and surely with it. Every teacher who teaches the subject 

 practically, knows how well he is repaid for the trouble 

 which the practical teaching has given him. 



A very large number of the figures have, by kind 

 permission, been taken from Professor Huxley's Elementary 

 Lessons, and one or two from Professor Mivart's Elementary 

 Anatomy ; the rest are either entirely new, or modifications 



of well-known figures. 



M. FOSTER. 

 L. E. SHORE. 



CAMBRIDGE, August 1894. 



