PREFACE. 
In presenting to the public this Illustrated and Descriptive 
Catalogue, it is our intention to furnish, especially to those 
living at a distance, the means of becoming acquainted with 
the various forms and qualities of the microscopes and micro- 
scopical apparatus which we manufacture. 
Having been engaged almost exclusively, for a series of 
years, in the manufacture of this important instrument, we 
have devoted great care and attention to improving the struc- 
ture of the mechanical parts, as well as to perfecting the qual- 
ity and efficiency of our object-glasses, and the optical parts 
in general. 
The extensive patronage with which we have been favored 
affords sufficient evidence that in our efforts to deserve the 
confidence of the scientific public we have not been without 
success. 
But while it has been our object to bring to perfection the 
branch of practical optics to which we have devoted ourselves, 
we have been constantly adding to our facilities for manufac- 
turing the various apparatus connected with the microscope. 
By the introduction of machinery especially adapted to our 
purposes, and by a judicious division of labor, we have en- 
deavored to secure the most finished workmanship in every 
part, at such prices as shall place the most perfect instruments 
^within the reach of all the lovers of science and students of 
nature. 
