THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



vol.. XVI. DECEMBER, 1895. No. 12. 



Some New Points in Photo-Micrography and Photo-Micro- 

 graphic Cameras. 



with frontispiece. 



By W. H. WALMSLEY, 



chicago, ill. 



Member of the American Microscopical Society. 



Photography in connection with the Microscope, Photo- 

 Micrography as universally termed, is now such an every 

 day atfair that one unacquainted with the facts can 

 scarcely realize that only a few years ago its practice 

 was confined to a very few enthusiasts at home and 

 abroad, and its results looked upon as interesting and 

 beautiful, but practically valueless. Yet such was the 

 case in the later seventies, when Dr. J. J. Woodward was 

 producing his marvellous Photo-Micrographs at the Army 

 Medical Museum in Washington. His work was such a 

 vast step in advance of any that preceded it, as to attract 

 the attention of the entire scientific world, and in many 

 respects it has never been excelled. Being confined how- 

 ever almost exclusively to the resolution, and delineation 

 of difficult test objects — -as diatoms and fine rulings on 

 glass — its sole practical value consisted in the improve- 

 ments in objectives, brought about by the efforts of many 

 eminent opticians both American and foreign, to meet 

 his exacting requirements. " The Battle of the Lenses," 

 will doubtless be remembered by most of you, and there 

 can be little doubt that the wonderful improvements in 

 and perfection of modern objectives, are due in a large 



