1 6 ELEMENTARY PHOTO-MICROGRAPHY. 



more wonderful to the uninitiated than the mark- 

 ings of Amphipleura pellucida magnified 3,000 

 times. It is only when the tyro attempts to obtain 

 these results himself that he realises the difficulties. 



Now, the possessor of a microscope has three 

 ways of showing the special objects of his study to 

 his friends. Firstly, he may exhibit the mounted 

 specimens in the ordinary way, when every indi- 

 vidual must of necessity look down the tube of the 

 microscope ; or, secondly, he may attach the 

 microscope to a lantern and throw the enlargement 

 upon a screen visible to all ; or, thirdly, he may 

 photograph the objects through the microscope, 

 and thus obtain a permanent and ever available 

 record. 



It is only with the last of these methods that 

 we have to deal at present, and it is taken for 

 granted that the reader is already familiar with the 

 use of the microscope, since it is much easier to 

 instruct the microscopist in the mysteries of photo- 

 graphy than it is to teach the amateur photographer 

 the uses of the microscope. If the reader, then, is 

 not conversant with the microscope, he is recom- 

 mended to study some good textbook on the 

 subject before attempting to photograph through 

 an instrument he does not understand. 



But there are many microscopists who are also 

 photographers, although they may never have tried 



