728 Microscopy at the International Exhibition. [ December, 
Joseph Zentmayer, of Philadelphia, who offers the most elaborate 
and elegant instruments as well as the largest variety of different 
forms. His ingenious contrivances and excellent brass-work are 
too familiar to need description. He shows the large American, 
intermediate, hospital, and clinical stands, and the new student’s, 
introduced a few years ago to meet the demand for histological 
instruments ; also a material modification of the American, in- 
troduced this summer and known as the model, having the three 
new features of a fine adjustment by a long slide close behind 
the rack and moved by a screw and lever nearly in the Ross 
position, an interchangeable stage which can be almost instantly 
removed and replaced by an extremely thin diatom stage, and a 
bar, which carries the substage and mirror, hinged at the level 
of the plane of the stage so as to enable the illuminating appara- 
tus to revolve with facility and in an easily measured position — 
around the object as a centre. He also exhibits a new pocket 
microscope of neat and apparently serviceable construction. 
T. H. McAllister’s case, in the photographic building, exhibits 
his two or three grades of instruments, with chain movements, 
thin stages, and often iron bases, built with a view to both econ- 
omy and excellence; and also a new-model physician’s micro- 
scope, which is literally a charming little instrument, very porta- 
ble and handsome, and combining with most of the excellencies 
of the maker’s former work the Zentmayer glass sliding stage 
and the diaphragm in the stage close to the object. The object- 
ives furnished with it vary from fair to the best, according to 
the pecuniary views of the purchaser. The accessories are of the 
usual forms. 
Bausch and Lomb, of Rochester, who have lately added to the 
province of the Vuleanite Optical Instrument Company, of that 
city, a microscopical department, under charge of E. Gundlach, 
formerly of Germany and late of Hackensack, N. J., exhibit a 
large series of entirely new designs. These are all of excellent 
workmanship, though of low or medium grade as to size, com- 
plexity, and cost. By simplifying the designs, introducing vul- 
canite into the mountings where it can be done to advantage, and 
introducing the business principle of attempting to create a large : 
demand by production at a very low cost, the experiment of of- - 
fering good instruments at a very low rate is being tried on & 
scale and with facilities unprecedented in this country. The 
special peculiarities of these stands, aside from the n 
mountings, are the hinging of the substage bar at the level 
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