PART II. 



INTKODUCTION. 



IN publishing methods of preparing, staining, hardening, 

 and mounting microscopic objects, I have adopted the 

 system employed in my classes for some years past ; that 

 is, each separate stage of procedure is arranged in succes- 

 sive lessons or chapters. A subject such as this cannot be 

 so lucidly described in writing as by demonstration, but 

 it has been my aim to make it as clear as possible, so that 

 if the instructions are carefully followed and practised, 

 successful permanent work can be performed ; but it is 

 only by most scrupulous care and constant practice that 

 any degree of success in this work can be attained. 



