PREFACE TO THE SECOND EDITION. 



SINCE the publication of the first edition, Photo- 

 micrography has become so general and the process 

 has so much improved, that it has been found 

 necessary to bring out a second edition, in which an 

 endeavour has been made to keep pace with the 

 advances of microscopy and to incorporate the more 

 recent improvements in photography. 



The title of the first edition was chosen after much 

 deliberation, although I was fully aware of its liability 

 to criticism on account of its ambiguity. The term 

 now employed though less euphonious certainly pre- 

 vents confusion. 



It was my original intention to answer some criti- 

 cisms in this preface, but on further consideration 

 they appeared so trivial and the writers showed such 

 complete ignorance of both the work and the subject, 

 that I thought it better to abandon it, and simply 

 thank those from whom I received many valuable hints, 

 and whose friendly criticism gave me so much en- 

 couragement. I only hope the result will be found 

 worthy of acceptance and of some little use in the 

 advancement of those scientific subjects to which 

 photo-micrography has been lately applied. 



A. COWLEY MALLET. 



December 8th, 1884. 



