44 
PROCEEDINGS OF SOCIETIES. 
would bo invisible, but if it bo wotted, then luminosity occurs ; the 
water serving as a channel for conveying light into the object. 
One preparer of objects had offered to mount diatoms and scales 
on the slides specially for this method of illumination if required. 
Mr. Richards brought before the notice of the Society an apparatus, 
founded upon Mr. Stephenson’s plan, for focussing under water. The 
difference between his own and Mr. Stephenson’s apparatus was this : 
In the latter each protecting cap must be made to suit every size of 
object-glass, while in the former (Mr. Richards’), by means of three 
concentric screws, the nozzle of the cap can be attached to an object- 
glass of any diameter, intermediate or the smallest. In using the 
instrument for salt water the tube can bo made of ebonite or brass, 
varnished. 
This apparatus is more particularly adapted to the American 
arrangement brought before the notice of the Fellows in the January 
number of the Journal. 
The Secretary announced that Mr. Ward had brought over two 
object-glasses, the latest production of Mr. Wales, the well-known 
American maker, and the Fellows spent a considerable time in the 
examination of these glasses. 
The meeting was then adjourned until the first Wednesday in 
October. 
During the month of August the Library and Museum will be 
closed. 
Donations to the Library and Cabinet from May 1st to June 5th, 
1872 : — 
From 
Land and Water. Weekly The Editor. 
Nature. Weekly Ditto. 
Athenaeum. Weekly Ditto. 
Society of Arts Journal. Weekly Society. 
Quarterly Journal of the Geological Society, No. 110 .. Ditto. 
Journal of the Linnean Society, No. 67 Ditto. 
Proceedings of the Royal Society of Tasmania, 1870 .. Ditto. 
The Lens, No. 2 Editor. 
The English Flora, Vol. V. Part 1st comprising the 
Mosses, Hepaticae, Lichens, Characeae, and Algae. 
Edited by W. J. Hooker, 1833 W. IP. Reeces. 
Couspectus of the Families and Genera of the Diato- 
maceae, Parts 1 and 2. By Professor H. L. Smith .. Author. 
Notes on New and Rarer Species of Diatomaceae of the 
U. S. Seaboard. By F. W. Lewis, M.D Prof. H. L. Smith. 
On Extreme and Exceptional Variations of Diatoms in 
some White Mountain Localities, &c. By F. W. 
Lewis, M.D. Ditto. 
On some New and Singular Intermediate Forms of Diato- 
maceae. By F. W. Lewis, M.D Ditto. 
Bulletin de la Socie'te' Botanique de France. July, 1871 Society. 
A slide of Foraminifera from the River Dee Thos. Shepheard, Esq. 
Fifteen Slides of Starch Granules J. Needham , Esq. 
John Emanuel Winspear, Esq., was elected a Fellow of the 
Society. 
Walter W. Reeves, 
Assist. -Secretary. 
