190 
Every student of the microscope knows how extremely 
unsatisfactory are the published engravings, be they the best, 
of objects as seen by means of lenses. For such required 
delineations the photograph presents an admirable and 
always reliable recorder of present appearances, or, in time 
future changes. 
It is not my intention, in these brief notes, to enter very 
largely into the importance of this mode of recording what is 
seen by means of the Microscope, as I believe that every 
student of Natural History is prepared to admit it at once. 
Nor do I intend to say much of what has already been done 
by others in this special field of photomicrography, only 
pointing to the results obtained by Dr. Maddox and others in 
England, Drs. Woodward, Curtis,—the former at present, 
the latter late of the Army Medical Museum at Washington— 
and Dr. Arnold, of this city, as examples of what can be 
done by perseverance and attention to the requirements of 
the case. I shall merely, in this short communication, put 
on record, as possibly of value to intending workers in this 
same field, some brief notes of my mode of working, and 
exhibit as the results I have obtained, the accompanying 
photographs and apparatus. 
To begin then—let the intending photographer bear in 
mind that the first and most important thing he will re- 
quire, will be what is so rare among portrait operators, that 
is to say, the power of being cleanly. In this branch of 
photography more particularly than in any other, is abso- 
lute cleanliness imperatively requisite. Clean hands, clothes, 
plates, bottles, vessels, solutions, camera, lenses, and lastly, 
but by no means least, clean objects. To begin with any- 
thing dirty is to court failure; to begin with everything 
clean is to ensure the best chances of success. Then have 
a good dark room into which absolutely no actinic light 
is permitted to enter, I have the window of my dark 
room (or more properly working room, for it is by no 
means dark) made of one large pane of orange colored 
glass, such as can be now readily purchased at the dealers, 
and, as itis a very perfect piece, find that it obstructs all or 
