PROCEEDINGS OF THE SOCIETY. 
419 
seemed to him to be rather an important point, as affecting the generally 
received idea of the mode of nourishment in plants. 
Mr. Nelson was unable to say what was the age of the specimens 
examined, as he did not prepare them himself. His impression was that 
there was an exceedingly delicate membrane covering a thicker mem- 
brane, which had a sieve-like perforation. The appearance struck him 
as being very much like that of a diatom just on the point of resolution. 
The President reminded the Fellows of the Society that their next 
Conversazione would take place on Wednesday the 30th inst. 
The following Instruments, Objects, &c., were exhibited:— 
Mr. P. Braham : — Spiral ruling on glass. 
Mr. T. Comber : — Photomicrographs of Eupodiscus Bogersii, Istlimia 
nervosa, Navicula aspera, and N. Durrandii. 
Mr. Goodwin : — Eye-piece with large field. 
Mr. Halford : — Spermatozoa of Salmonidse. 
Mr. E. M. Nelson: — Asteromphalus Arachne, viewed with Powell and 
Lealand’s new apochromatic objective, 1/4 dry. Slides of bordered pits 
of Finns sylvestris and radial structure of Finns and Tilia. 
Messrs. Powell and Lealand : — Mayall’s Jewelled Fine-adjustment. 
Mr. Eousselet : — Eotifers. 
Mr. W. West:— Slides of Desmids from Capel Curig, North Wales, 
in illustration of his paper. 
New Fellows : — The following were elected Ordinary Fellows : — 
Messrs. James M. Allen, James B. Bessell, Frederick Justen, F.L.S., 
Herbert S. Martin, Henry W. Parritt, Helenus E. Eobertson, Theodore 
Stanley, M.D., W. Le Conte Stevens, and Miss C. C. Crisp. Prof. F. 
Leydig, of Wurzburg, was elected an Honorary Fellow. 
Meeting op 21st May, 1890, at 20, Hanover Squarp:, W., 
James Glaisher, Esq., F.E.S., Vice-President, in the Chair. 
The Minutes of the meeting of 16th April last were read and 
confirmed, and were signed by the Chairman. 
The List of Donations (exclusive of exchanges and reprints) received 
since the last meeting was submitted, and the thanks of the Society given 
to the donors. 
From 
Pringle, A., Practical Pliotomicrography by the latest methods. 
183 and ix. pp., 6 pis. and 42 figs. (8vo, New York, 1890) .. Mr. A. Pringle. 
Marzoli’s Achromatic Lens (1808) 
{ 
Messrs. Trainini Bros., 
of Brescia. 
Mr. J. Mayall, junr., referred to the donation by Mr. Andrew Pringle 
of a copy of his recently published work on ‘ Photomicrography.’ He said 
