PROCEEDINGS OF SOCIETIES. 243 
like the process used for separating diatoms from sand and other 
coarse material, in mounting for the microscope. The course of. 
the little stream running into the pond is for a few rods through 
aridge of drift material. This undoubtedly furnished some sand 
and coarse material, but it would be deposited almost immediately 
on entering the quiet water of the pond, and undoubtedly it will 
now be found directly against the entrance of the stream. 
After the examination of this place, the conclusion must be 
that this deposit has been forming ever since the close of the 
drift period, when the surface of the earth received its present 
conformation. 
APOTHECARIES’ SOCIETY. 
On Tuesday, the 31st of May, the Master and Wardens of the 
Society of Apothecaries opened» their ancient hall in Black- 
friars to receive a large party of scientific men and their friends, 
As at this conversazione the chief objects of interest that were 
exhibited were microscopes, microscopic objects, and enlarged 
diagrams, we select from the accounts in the papers and 
journals a few extracts, as a record of an interesting event, and 
an expression of our gratitude to the liberal hosts who so muni- 
ficently catered for the intellectual benefit of their friends. The 
‘Medical Times and Gazette,’ describing the entertainment, 
says, “ Very seldom in this country has such a magnificent col- 
lection of microscopes and microscopical objects been brought 
together. All the great manufacturers of microscopes con- 
tributed instruments. It would be impossible to give anything 
like a full list of the varied and beautiful objects displayed. We 
may notice, however, a few of them. Amongst those exhibited 
by Messrs. Powell and Lealand was the circulation of the sap in 
the Valisneria, shown by a = th inch object-glass. Mr. Warring- 
ton exhibited, in a small aquarium, Phoronis Hippocrepia, the An- 
nelidan homomorph of the Hippocrepian Polyzoa. The Hippo- 
erepian tentacular plume, with the csophagus and the vessels 
conveying the blood to and from the ciliated tentacule, were 
beautifully shown. Mr. Ross exhibited some objects under 
Kelner’s large field eyepieces. A number of binocular micro- 
scopes were shown by Messrs. Crouch, Murray and Heath, 
Edmund Wheeler, Gould, Smith and Beck, and others. Mr. 
Jabez Hogg contributed a beautiful specimen of Trichina spiralis. 
But, besides microscopes and microscopical objects, there were 
many other things exhibited of great scientific interest. Dr. 
King and Dr. Stephen Ward showed a series of very interesting 
ethnological water-colour sketches taken from life by Mr. Say, 
Mr. Stephen Ward, Miss F. Corbaux, &c. We were espe- 
eially struck with the ‘Study of head of young Bushman,’ by 
