238 ee Lawrence Smith on the Inverted Microscope. 
required the former is moved by the fingers, which can readily 
impart to it the most delicate motion, as ther are in part supported 
by the edge of the fixed stage. For this suggestion I am indebt- 
ed to Prof. Riddell, and both he and myself, after much experi- 
ence, feel convinced of its usefulness. 
In observing with high powers, as the object-glass is beneath 
the glass supporting the object, and-as this glass is usually of a 
nee eee 
* As Prof. Riddell, of the Medical Department of the University of ae ee | 
has been using my microscope for general purposes for more than oP het ban Penn 
of him his opinion as to its advantages, which is expressed in the fol ee ae 
Prof. J. Lawrence Sutra :—Dear Sir,—In reply to your note respecting Laila 
verted Microscope, I have to say that having cmesiy been in_ the habit of the 
the mountings of Pritchard, Dollard, Raspail, Chevalier and Nachet, and having 
