168 
PROCEEDINGS OF THE SOCIETY. 
a balsam angle greater than 106° ; then he showed the aperture of a 
high-angled dry lens to be within double the critical angle, i. e. less 
than 82° in glass ; then he showed the aperture of Tolies’ ^ immer- 
sion to be in excess of the limit for dry lenses, i. e. greater than 82° in 
glass. The demonstration was conducted in the presence of Professor 
Stokes, Mr. W. G. Lettsom, Mr. J. H. Dallmeyer, Mr. F. Crisp, and 
others interested in the subject. 
The meeting was then adjourned to the 9th October, and the 
President reminded the Fellows that the library and reading room 
would as usual be closed during the month of August. 
Donations to the Library, &c., since April 3, 1878: 
From 
Nature. Weekl)'’ The Editor. 
Athenseum. Weekly Ditto. 
American Journal of Microscopy, March, 1878 Ditto} 
Society of Arts Journal. Weekly Society. 
Quarterly Journal of the Geological Society Ditto. 
Bulletin de la Societe Royale de Botanique de Belgique Ditto. 
Bulletin de la Societe Botanique de France Ditto. 
Papers and Proceedings of the Royal Society of Tasmania, 1876 .. Ditto. 
Transactions of the Watford Natural History Society. Part 9 .. Ditto. 
Journal of the Linnean Society : Zoology. No, 74 Ditto. 
Report and Abstract of Proceedings of the Croydon Microscopical 
Club, 1877 Club. 
Mineralogical Magazine Society. 
An Old (“ Conicai ”) Microscope with Apparatus S. S. Wigg, Esq. 
The following gentlemen were elected Fellows of the Society : — 
Dr. James Edmunds ; Major Kichard O’Hara. 
Walter W. Eeeves, 
Assist. -Secretary. 
