10 MaddoXj on the Delineation of Microscopic Objects. 
andj no doubt, as in tlie parts now considered necessary 
appurtenances to the microscope, we should, ere long, find 
the deficiency supplied. 
Again, much objection has been taken to the application 
of photography for obtaining drawings of microscopic objects, 
not simply, as stated, in an optical point of view, but also 
from the reason that we are accustomed to learn all we can 
of any object under observation by every means placed at 
our disposal, these being gathered, as it were, by the draughts- 
man, and combined by his skill to represent that which he 
has separately observed ; whilst in the employment of pho- 
tography we must rest content, if in one drawing, with what 
we consider the best general view of the object, or some parti- 
cular part. Here, however, we have this advantage, there 
are no notable mistakes of relative magnitude, distance, or 
separation of parts, upon the strict correctness of which 
much in scientific observation depends ; also, parts incapable 
of being easily, if at all, rendered by the hand can by its 
use be traced in more than mere outline ; for it is possible, 
in very many cases, though needing considerable patience, 
to obtain some shadows and markings in objects which are 
commonly, if not entirely, ignored by the artist, even with 
the advantage of continued examination. Whatever may be 
his legitimate omissions, all must admire his great skill in 
beautiful delineation, and appreciate his work — work which 
will, no doubt, increase with the employment of photography 
for the purpose here advocated. 
The general application of Mr. Wenham^s excellent 
arrangement for giving sterecopicity to objects by means of 
the binocular microscope will, probably, tend to greatly 
alter the ordinary methods of rendering engravings or draw- 
ings of microscopic subjects, especially when viewed as opaque 
bodies, and we shall then, perhaps, be more ready to appre- 
ciate their photographic representation. 
If we divide the advantages of photomicrography into 
their twofold character, we shall find the one derived from 
the facility with which an object can be rendered in its chief 
or general aspect, thus afi*ording considerable assistance for 
its recognition by others, retaining in its freshness much in- 
tact, even in its minutiae, which often becomes greatly 
altered when preserved in any of the usual media; whilst 
the other tends to an opposite direction, and points at once 
to the difficulty experienced when we attempt the photo- 
graph of portions or entire surfaces of minute objects with 
their details ; the opprobrium and perplexity here combine. 
The correctness of the position assumed will; I trusty 
