viii PREFACE TO THE REVISED EDITION. 



Anatomy, of Histology, and of the Elements of Embry- 

 ology and of Physiology, such as under the present system 

 is either not acquired at all, or is gained at the expense of 

 time and labour which can be ill spared from practical 

 subjects. 



T. H. HUXLEY. 



November, 1887. 



