REPORTS FROM THE SECTIONS. 265 
The following gentlemen were elected as members of the 
Committee for the current year:—Mr. A. Roperrs, M.R.C.S. 
A HA | 
th. 
The Secretary, on behalf of Mr. H. Sharp, of Adelong, 
presented to the Socieiy’s cabinet a series of twelve slides, con- 
sisting chiefly of animal parasites, neatly mounted in glycerine, 
with tin cells. 
A vote of thanks was unanimously accorded to Mr. Sharp. 
. Hirsr exhibited Swift’s new patent achromatic 
condenser He described its construction, and read a few notes 
n the use of achromatic condensers generally. 
cr. cDonNELL preg a metal gauge for measuring 
thin glass covers to the ys'so inch. 
e Rev. Gro. Marrrn exhibited Crouch’s No. 1 A binocular 
rideeascepe e, a particularly arte enn Se with concentric 
rotating stage, sub-stage, and appar 
Dr. Mitrorp exhibited a large. eee by Collins, with 
sub-stage and achromatic condenser added by Gaunt, of Mel- 
Mr. G. D. Hrrsz exhibited a prize medal binocular by Swift. 
MONDAY, 11 JUNE, 1877. 
Mr. H. G. A. Wricut, M.R.C.S., in the Chair. 
‘ The minutes of the preceding meeting were read and con- 
rmed. 
Mr. Wa. MacDoyyett introduced the subject of the micro- 
scopical analysis of drinking water; and a discussion ensued as 
to the best means of obtaining and preserving sediments for 
examination. 
lt was arses that the matter should be brought before the 
next mee 
Mr. G. De Hirst exhibited Bramhall’s illuminator, ee 
of a plain mirror introduced beneath the slide on the stage of 
the microscope. The light being thrown down on the mirror by 
means of the bull’s-eye condenser, is reflected obliquely up 
through the slide, — the object in its passage; the 
advantage claimed for this simple piece of apparatus being a 
resolving power on close-lined tests nearly equal to a large- 
angled achromatic condenser. In illustration of its power, Mr. 
Hirst showed a valve of the WV. rhomboides with the transverse 
lines, sig ig the inch, perfectly resolved under a x's inch 
immersion 
