jSLlKTiff] PROCEEDINGS OF SOCIETIES. 375 
The increased obliquity thus given to the emergent pencils by 
means of this third lens causes the finest lines and markings to be 
brought out with unusual distinctness. What is wanted for the 
closest lines is the greatest obliquity possible. Those who happen to 
have the double condenser would find the addition and adjustment of 
this third lens very easy, and the working of the instrument much 
improved by the greater ol3liquity of the emergent pencils. The lamp, 
as the source of direct light, should be placed about 10 inches from 
the stage of the microscope, the rays being rendered parallel by a bull's- 
eye condenser. 
The next meeting will be held on June the 9 th, which will be the 
last this season. 
Donations to the Library, May 12, 1869 : — 
From 
Land and Water. Weekly Editor. 
Scientific Opinion. Weekly Editor. 
Society of Arts' Journal. Weekly Society. 
The Student Publisher. 
On British Graptolites. By J. Hopkinson Author. 
The Quinology of the East Indian Plantations. By 
John E. Howard. F.E.M.S., &c Author. 
Papers and Proceedings of the Eoyal Society of Tas- 
mania, 1866-7 Society. 
Journal of the Geological Society, No. 98 Society. 
On some New Species of the Genus Unio. ByDr. J. Lea Author. 
Forsok till en Monograph ofver Monstroma. Af V. B. 
Wittrock Author. 
Algologiska Studier. Af V. B. Wittrock Author. 
Smithsonian Reports for 1863-5 Society. 
The following gentlemen were elected Fellows of the Society : — 
Joseph Dickson, Esq., M.D. 
W. Ford Stanley, Esq. 
Walter W. Eeeves, 
Assist. Seci-etary. 
QuEKETT Microscopical Club.* 
At the ordinary meeting, held at University College, on April 
23rd, Arthur E. Durham, Esq., F.L.S., President, in the chair, — 
eleven new members were elected, and twenty gentlemen were pro- 
posed for membership. A number of donations to the club were 
announced, including slides to the number of 173. The President 
gave notice that the next meeting would be made special for the 
consideration of important alterations in the bye-laws, and the rules 
as proposed to be amended were severally read over by the Secretary. 
Mr. B. T. Lowne read a highly interesting paper, entitled " Some 
further Eemarks on the Proboscis of the Blow-fly," being supple- 
mental to a paper which he read upon the same subject at the meeting 
of the club in November last. The paper — which was illustrated by 
* Report supplied by Mr. E. T. Lewis. 
