PROCEEDINGS OP THE SOCIETY. 
125 
Mr. Karop pointed out that if only central light was used it was not 
necessary that the whole of the series of media from objective to con- 
denser should be homogeneous, but if oblique light v/as used then it was 
essential. 
Mr. Nelson said he thought there was no doubt that these photo- 
graphs were taken with oblique light, because they showed the longi- 
tudinal striae thrown out into space. In his own observations he had 
thought he could see some sign that the longitudinal striae were begin- 
ning to be resolved, but he had searched for the spectra in vain. He 
supposed that with the new objective they might be able to see the 
beginning of the blue. He thought it was quite safe to say that the 
pictures had been taken with a narrow pencil of light, and if so they did 
not offer a fair test of what the objective was able to do, because it was 
very well known that with a small pencil like that they could make the 
appearance anything they pleased. 
The Chairman said he thought he should express the feeling of all 
who were present in saying that they were extremely glad to have had 
the opportunity of hearing these descriptions and of seeing the photo- 
graphs to which they related, and that their hearty thanks were due to 
those who had enabled them so to profit. 
The following Instruments, Objects, &c., were exhibited:— 
Mr. H. P. Aylward : — Series of Botanical Sections. 
Prof. Fol : — Stereo -photomicrographs of Human Embryos. 
Mr. W. Godden : — Slides of Diatoms from the Isle of Skye. 
Mr. E. M. Nelson : — Semi-apochromatic Objective in illustration of 
his paper. 
Mr. Eousselet : — Tank for Rotifers, &c., with lens attached. 
New Fellows: — The following were elected Ordinary Fellows: 
Messrs. Walter H. Collins, F.C.S. ; Frank Conway ; Samuel Gaskino- 
B.A. ; W. K. Higley, Ph.D. ; G. C. Huber, M.D. ; Abraham Leigh’ 
M.D. ; and Mark L. Sykes. 
Meeting of 8th January, 1890, at King’s College, Strand, W.C. ; 
THE Rev. Dr. Dallinger, F.R.S. (Vice-President), in the Chair.*’ 
The Minutes of the meeting of 11th December 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 oiven 
to the donors. ^ 
From 
52 Photomicrograpliic Slides Mr. T. F. Smith. 
MS. Catalogue ot Mr. Kedmayiie’s Collection of Diatoms .. .. Mr. Burgess. 
