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city which was represented to be chalk, but, which upon 
examination proved to be siliceous, doubtless of ‘the same 
character as the substance alluded to by Mr. Ward. Some, 
for instance, from Western Virginia, was found to be Kaolin. 
The President alluded to the deposits of Kaolin, which are 
being worked at Brandon, Vermont, and Mystic, Connecticut, 
and which are washed so as to free them from their coarser 
particles, and then come into the market under the name of 
“china clay,” to be used in paper making. The material 
used in China for the manufacture of porcelain is not a 
natural clay, but is derived from the pulverization of a 
rock, found in a range of mountains which have given their 
name to the material. 
The following paper was read; 
Some Notes on obtaining Photographic Representations of Objects 
of Natural History by means of the Microscope. 
By Pror. A. M. EpWARDs. 
Brief as I shall be compelled to make the remarks I intend 
here to set down, yet the importance of the subject of which 
I treat, will, I feel assured, obtain for them a welcome from 
my fellow microscopists. Although we find our text-books 
and special treatises truly embellished with beautiful illustra- 
tions, colored or uncolored as the subject requires, executed 
in all kinds of engraving and with all the skill of experienced 
artists, who are often accomplished naturalists as well, and 
correctly comprehend the characters and relations of the 
objects they attempt to delineate, yet in every case the 
student of Biology finds something wanting, and never 
completely recognizes in the counterfeit on paper the subject 
of his study. And this is more particularly and strikingly’ 
the case, when we take into consideration the manifold 
wonders revealed by means of the microscope, and which the 
artist can rarely move about, turn over and examine from 
different points. Besides he is compelled to delineate that 
which he cannot handle, and only sees “in a glass darkly.” 
PROC. LYC. NAT. HIST. N. Y.—VOL. L 13 
