74 THE NORTHERN MICROSCOPIST. 
calculated to save the future worker some trouble; but I must 
confess that the general principles of the process were but meagrely 
illustrated, and as the process recommended was the wet collodion 
one, I consider there is still room for a good practical dissertation 
upon the subject. 
The use of photography for the purpose of delineating micros- 
copic objects is not new. In a paper read before the Philosophical 
Society of Washington, U.S. A., Dr. Woodward makes allusion 
to several Daguerreotypes of objects taken by Prof. Draper, with a 
Nachet microscope, at various dates from 1851 to 1856. ‘These 
were probably the first attempts at photo-micrography ; and, no 
doubt, were very much inferior to the productions of the present day. 
The most successful photographers of microscopic objects have 
been, Col. Woodward, Dr. Maddox, Mr. Wenham, Drs. Aber- 
crombie and Wilson, Mr. Shadbolt, and the late Dr. Redmayne, 
of Bolton, some of whose pictures by the kindness of Mr. Ward, 
of Manchester, I am enabled to show you to-night. You will 
probably have noticed that photo-micrographists who use high 
powers generally select diatoms for their subject, and the reason 
of this is that being flat, the picture lies in one plane and the 
whole of it comes into focus at once very distinctly. 
If we glance over the bibliography of our subject we shall find 
that most of the productions have emanated from Col. Dr. Wood- 
ward, and one of his reports to the Surgeon-General of the U. S. 
army and published on page 169 of Vol. VI. of the Monthly 
Microscopic Journal, gives the details of his process at great 
length. I will not trouble you by reading his method, which, no 
doubt, you can all see by consulting your library, and therefore pass 
on to the immediate subject of this paper, which is to describe a 
method of taking photographs of microscopic objects at any time, 
in any place, and with the ordinary materials found in the hands 
of the photographer and microscopist. 
The camera employed is shown in fig. 7, and is of the structure 
and form I specially recommend. You will no doubt hear some 
quite as strongly advising the use of a bellows camera, but there 
are serious objections to the use of such a one when extended to 
four or five feet. This camera, you will observe, is made to detach 
from the base board, but for portability only. The base board 
should project for some distance in front of the camera in order to 
carry the microscope and illuminating apparatus. The whole 
should be placed upon a firm table, quite free from vibration, in 
order to ensure perfect sharpness of the image upon the sensitive ~ 
plate. My original apparatus was of French make and of large 
size; but it was soon discovered that a large camera was of very 
little use with the foreign lenses supplied with the apparatus. After 
this I made one of deal, or rather a portion of one to lengthen an 
