424 
PROCEEDINGS OF THE SOCIETY. 
Mr. C. Lees Curties exhibited a new form of camera lucida which 
he had just received from Herr Leitz of Wetzlar, which could be used 
with the Microscope in any position. It was a single prism, non- 
revolving, and gave a view of the whole field of the eye-piece, but as it 
had only reached him that afternoon he had been unable to experiment 
with it. The one exhibited was made to fit the usual continental model ; 
it formed its own eye-piece and was about equal in power to the 
ordinary B. 
The President thanked Mr. Curties for bringing this little piece 
of apparatus for exhibition. 
Sir David L. Salomons having been called upon by the President 
to give an exhibition with his Projection Microscope, prefaced his 
remarks by expressing a hope that he was not displacing a paper which 
he had noticed was also announced to be read that evening. In bring- 
ing his lantern before them he was going to show them a few examples 
which were not altogether connected with the Microscope, but which he 
thought they might be interested in seeing, as showing how wide a field 
it was able to cover for purposes of scientific illustration. He thought, 
however, that it was due to the Fellows of the Society present to say 
that he had been unable to test the apparatus in that room before the 
meeting on account of not being able to obtain darkness, so that it 
might be necessary to make some few adjustments as he proceeded. He 
had also not been able to make use of any very high powers, because 
they would necessitate the use of a more powerful light than it would 
be possible for him to obtain on that occasion. He employed as an 
illuminant an electric arc light, and the use of a high power necessitated 
a larger current than it might be advisable to use, not being quite sure 
of the capacity of the wires in the building to carry it, and not caring 
to run the risk of some of the fuses going and so spoiling the exhibition. 
The lantern-case was made so as to turn freely upon a centered ring 
platform enabling either of the nozzles to be turned towards the screen 
as might be required. The cylindrical case was fitted with a catch for 
getting the optical apparatus properly centered, and this was so con- 
structed that he was able to tell by touch when the adjustment was 
correct. The first picture thrown upon the screen was a photograph of 
the apparatus, showing it with the polariscope on the right and the 
Microscope on the left. No. 2 showed it from another aspect with the 
Microscope nearly facing the observer, also showing the third front ; and 
No. 3 gave a view of the table used in connection with it for use in the 
exhibition of chemical or electrical experiments. The projection Micro- 
scope was then brought into position and the following objects were 
exhibited : — The proboscis of blow-fly ; section of eyelid ; transverse 
and vertical sections of scalp showing hair-follicles ; section of lung of 
frog ; section of toe of mouse ; ovaries of house-fly ; section of eye of 
fly ; acarus of carrion crow ; larva of bot-fly ; section of mineral ; hair 
of Egyptian mummy ; piece of a feather of emu ; sections of wood of 
camphor tree in three directions ; pollen-grains in situ ; stinging organs 
of nettle ; starch-granules in section of potato ; mineral section ; 
filariae in blood — in febrile disease ; Trichina spiralis in pork ; palate 
of garden snail ; spicules of Gorgonia and Holothuria ; hair of Indian 
