406 NOTICES OF THE MEETINGS. [March 10, 1854. 
ference was so conspicuous, that some were inclined to doubt the 
identity of the objects. 
The whole subject of the illumination of opaque objects, as well 
as that of oblique illumination, by Kingsley's condenser, and by 
the prisms of Nachet and Amici, of which diagrams were exhibited, 
and by other means, was unavoidably omitted 
Microscopes by the three Jeading makers were placed on the 
table ; between the optical parts of which Mr. Brooke declined the 
task of drawing any invidious distinctions. He however expressed 
a preference for the stand of Mr. Ross, on account of its having 
a secondary stage with rectangular adjustments, and a rotatory 
movement by which any iliumimating apparatus may be made to 
revolve after its axis has been brought to coincide with that of the 
microscope. 
A stand by Mr. Ladd was also exhibited, in which the various 
movements are effected with great smoothness, and without ‘ loss 
of time,” by means of wrapping chains: also the ingenious appa- 
ratus of Mr. Highley, for obtaining photographs of microscopic 
objects, of which time did not admit of any explanation being 
offered. 
In a curious and complicated microscope, the property of Prof. 
Quekett, constructed about the middle of the last century by 
Benjamin Martin, might be noticed several points of construction, 
that have been introduced as recent improvements. 
[C. B.J 
