118 MICROSCOPY. 
lower races. For this reason, then, peculiarities of races become 
obliterated in time. — The Academy. 
“MICROSCOPY. 
A FIELD-STAGE ror ŪLINICAL' Microscores.— Dr. R. H. Ward 
called attention at the Dubuque meeting of the American Associ- 
ation, to a contrivance by which he-is able to employ in field 
work the ordinary form of clinical microscopes. Such micro- 
scopes are but little available for opaque objects, the small open- 
ing sometimes made through the tube just above the stage being 
objectionable in respect to focussing and being nearly useless for 
illuminating purposes by ordinary daylight. The new field-stage is 
a perforated brass stage-plate occupying the position of the object 
and bearing a contrivance by which the object is carried at the 
distance of about an inch lower down. In the instrument shown 
to the Association, which was home-made and could be made by 
any one in a few moments, a heavy brass wire was carried down 
from the brass stage-plate, bent so as to form a rectangular frame 
on which the object-slide or compressor could rest, and then bent 
back to the stage-plate again. It was attached to the stage-plate 
by being bent at right angles and soldered along the sides of the 
plate to its under surface. The object was held upon this acces- 
sory stage by slender wire springs also soldered fast. With this 
new stage the clinical microscope becomes available for low pow- 
ers and opaque objects. _ 
Pigorr’s ‘t SEARCHER” IN THE Brnocutar.— Dr. John Barker 
exhibited to the Dublin microscopical club a one-inch objective 
employed as a ‘‘searcher,” as suggested by Dr. Pigott. His 
object was to propose its application to the binocular microscope 
by inserting a one-inch objective in each body, and thus attain in 
connection with stereoscopic vision, the high amplifying power of 
such arrangements. 
UNDER-CORRECTED OBJECTIVES.— Objectives considerably under- 
ted as to color are now furnished by a variety of leading 
makers and are generally preferred by critical microscopists. 
They not only work better for photography and with monochro- 
matic illumination, but they excel for ordinary work those lenses in 
which the corrections for spherical aberration are sacrificed for the 
oe ke of a more perfect achromatism. Powell and Lealand, Tolles 
