392 
PROCEEDINGS OF THE SOCIETY. 
at once, and yon may work for an hour with an ordinary ^ and never 
separate them. The slides will serve as well as anything to show the 
value of the glass.” 
He also read extracts from a letter received from Dr. Fripp, 
of Bristol, in regard to Mr. Ballinger’s paper on the measurement of 
the diameter of the flagella of Bacterium termo. (The letter will he 
found on p. 337.) 
Mr. Stewart exhibited and described with drawings on the black- 
board a slide of Onchopora hirsuta which Mr. Weigh tman, of Liverpool, 
had sent to the Society. 
Mr. Crisp exhibited (1) Zentmayer’s “Centennial” microscope, 
which had obtained a medal at the Paris Exhibition. The stand is 
provided with three different stages ; a mechanical one with the usual 
movements, a large circular one with concentric rotatory motion, 
and a small concentric rotating “ diatom-stage ” bevelled out on its 
under surface, so as to allow of extremely oblique illumination, or, if 
still greater obliquity is desired, the stage can be reversed and the 
slide attached beneath, so that the utmost freedom is obtained for 
oblique illumination. The sub-stage bar, carrying the mirror and 
condenser, is made to swing on a pinion adjusted so that the object 
itself forms the centre of rotation; thus the sub-stage appliances 
can be used at any degree of obliquity beneath the object, or they 
may be swung above the stage for illuminating opaque objects. 
(2) Photograph of the Tolles-Blackham microscope (lent by Mr. 
Mayall), showing the circular disk that had been devised to obtain a 
swinging motion to the sub-stage without infringing Mr. Zentmayer’s 
patent. (3) Photograph by Col. Woodward of AmpJiipleura pellucida 
in balsam, by Tolies’ yL immersion (glycerine) objective. 
The following gentlemen were elected Fellows of the Society; — 
Captain Peter G. Cunlifife ; M. Julien Deby, Vice-President of the 
Belgian Society of Microscopy ; Mr. John Morris, F.S.S., F.Z.S. 
Scientific Evening. 
The first Scientific Evening of the Session was held in the 
Libraries of King’s College on the evening of Wednesday, the 27th 
November, 1878. 
The following were the objects exhibited : — 
Mr. Beck : 
Artificial siliceous deposit with markings resembling those on 
Pleurosigma angulatum. 
A new crystal — quinate of quinine — polarized. 
Mr. Gorham’s complementary colour disks. 
