MICROSCOPY. 58 
members of the committee ; Profs. R. H. Ward, M.D. of Troy, 
New York, H. L. Smith of Hobart College, Messrs R. B. Tolles 
of Boston, Mass., W. S. Sullivant of Columbus, Ohio, J. B. Rich 
of pe York City, William Wales of Fort Lee, New Jersey, 
Charles A. Spencer of Canastota, New York, Joseph Zentmayer 
of o ign, Pennsylvania, and J. Grunow of New York City. 
A New Accessory SraceE. — Messrs. James W. Queen & Co., 
of Chestnut Street, Philadelphia, and Broadway, New York, have 
contrived a stage which can be used with any microscope and which 
will commend itself to many microscopists as a very useful acces- 
sory. It consists of a brass stage-plate, perforated in the centre 
for the transmission of light and bearing, at one end, four pillars 
which support, at the height of about an inch, a second plate. To 
the under side of this second plate the object-slide is attached by 
Fig. 6. 
means of slight springs which allow it to be easily misplaced. It 
is evident that this contrivance admits of any degree of obliquity , 
of illumination without regard to the construction of the stand on 
which it is used; and the slight awkwardness of adapting an ach- 
romatic condenser to this apparatus is nearly negatived by the 
fact that most microscopists prefer to obtain extremely oblique 
illumination either by a prism, or directly (unmodified) from the 
source of light, for both of which this arrangement is especially 
available. The comparative safety of the thin glass cover over 
the object will also be appreciated by the many persons who have 
seen a rare or costly object, such as the Type Plate, or Nobert’s 
Lines, ruined by an incautious touch of a high power objective. 
Magniryinc Power or Ossectives. To the Editors of the 
American Naturatist. Dear Sims:— With great interest and 
pleasure I have followed the preliminary movements to establish a _ : 
