CHAPTER I 



INTRODUCTORY 



The distinction between a Photo-Micrograph 

 and a Micro-Photograph would seem to have 

 been settled a good many years ago, fully 

 a quarter of a century, at least, yet we 

 continually hear the latter name applied indis- 

 criminately to either ; an illustration of persist- 

 ence, it having preceded the former by other 

 long years. As defined by Worcester, however, 

 a Micro-Photograph " is a minute photograph 

 of any subject, so small that its form or details 

 are invisible to the unaided eye, requiring the 

 use of a microscope to see them." A prac- 

 tical illustration of these may be found in 

 the so-called " charms," many of them shaped 

 like a miniature opera -glass, containing a 

 Stanhope lens, to the flat end of which is 

 attached a minute photograph. On holding 

 it to the light and looking into the other end 

 an enlarged picture is seen. The subjects are 

 almost innumerable in variety and interest. 

 They are all made in Paris, I believe. For- 

 merly they were also to be had mounted on a 



A (l) 



