PEEFACE. 



rilHIS book has had its origin, on the one hand in 

 - the directions for practical work which I have had 

 printed these twenty years for the guidance of students 

 attending my course of Practical Histology, and on 

 the other hand, in the directions and descriptions for 

 elementary students which I have from time to time 

 inserted in the Practical Physiology and Histology of 

 Professor Sir M. Foster and myself. The histological 

 account given in the last Edition of the Practical 

 Physiology and Histology has been, in large part, 

 transferred to this book with such modifications as 

 seemed necessary; and the more advanced work has 

 been added to it. 



The methods which I have tried, I have generally 

 taken from the original sources. But I have not always 

 done this, since in a work of this kind the Authors' 

 names can rarely be given with advantage to the 

 student. I wish to acknowledge my indebtedness to 

 the Abstracts published in the Zeitschrift f. Wissenschaft- 



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