PREFACE. 



BOOKS on photo - micrography, although 

 numerous, are chiefly both expensive and 

 perplexing, covering as they do much ex- 

 traneous ground that has little or no interest for 

 the beginner who wishes simply to learn how to 

 take photographs through a microscope. Indeed, 

 some of the works professing to deal with the 

 subject of photo-micrography are little better than 

 trade catalogues, and devote far more space to the 

 description of various microscopes and accessories 

 than to the elementary information generally 

 desired. Others, again, specify expensive appli- 

 ances beyond the reach of an ordinary person, so 

 that the reader is deterred from taking up the 

 subject at all. 



Now, instead of filling the novice with dismay 

 at the difficulties to be encountered, it is my inten- 

 tion to make the matter so easy that he may be 

 encouraged to proceed. 



When lecturing in different towns, I have been 

 surprised to find what an amount of interest could 

 be aroused in working men, many of whom have 

 been stimulated to commence photo-micrography, 



