50 THE AMERICAN MONTHLY [Mar 
dium for more rapid photography, some time in the fifth 
decade of last century, it became possible both to make 
very small copies of large objects, and to produce en- 
larged copies of small ones. It was at first proposed to 
distinguish these two different forms by the terms ‘‘alpha- 
graph” and “omegraph”; but the late Mr. George Shad- 
bolt, while editor of the British Journal of Photography, 
suggested the terms “micro-photograph” and ‘“photo-mi- 
crograph,” and these latter terms have been universally 
used to distinguish the two forms from each other ever 
since—the term micro-photograph being invariably ap- 
plied to small photographs of large objects, while the 
term photo-micrograph is used to signify a large copy 
from a small one. Notwithstanding this general consen- 
sus of opinion, however, it is found almost daily that the 
two terms are used indiscriminately to signify an en- 
larged copy from a small object. Medical men seem to 
be peculiarly prone to get confused by the two terms. 
The camera to be used for the production of micro- 
photographs should be one with a rigid front, or capable 
of being rigidly fixed in that position, while that portion 
carrying the dark slide should also be capable of being 
rigidly fixed in the position it is to occupy while the pho- 
tograph is being taken. The old form of box-camera 
would seem to be the very best form for this purpose. 
The flange in.the camera front, used along with the acces- 
sory referred to, was that taking the Ross portable sym- 
metrical and other lenses having the same size of screw. 
Into this flange there was screwed a thick drawn tube, 
such as is used for telescope eye-tubes, the tube being as 
the aperture in the flange would admit of. A ring was 
soldered on the outside of this tube, which was screwed to 
take the screw in the flange. The tube entered inside the 
flange about two inches, and was sprung at the end in- 
side with cuts resembling the letter T placed horizontally. 
The other end of this tube or jacket was cut with an in- 
