1066 PROCEEDINGS OF THE SOCIETY. 



doing justice to Mr. Nelson, who ilcserves the more credit for his obser- 

 vation, as in the preparation ho examined the point had escaped my own 

 notice, which was directed to another feature — viz. the filament and 

 membrane, both of which are clearly shown in one of the accompanying 

 photograjihs. I hope the Society will be good enough to promulgate 

 this note, as though it may be a matter of iudiftcrencc to Mr. Nelson, it 

 is not so to me — viz. that I should appear to allow to be attributed to 

 me an observation first made by another." 



The following Instruments, Objects, &c., were exhibited;— 



Lord Edward S. Churchill : — Photomicrographic Apparatus. 



Mr. Crisp : — (1) Cutter's Cam Microscope ; (2) Fasoldt's Patent 

 Microscope ; (3) Zeiss's " Micron " Eye-piece Micrometer ; (4) Eowland's 

 Keversible Compressorium ; (5) Safety Stage with Adjusting Screws. 



Mr. Dowdeswell : — Photomicrographs of Spermatozoa of Triton. 



Mr. E. H. Griffith :— Griffith Club Microscope with new Fine- 

 adjustment. 



Mr. E. M. Nelson : — Photomicrographs of Amphiplenra pellucida. 



Mr. T. F. Smith : — Photomicrographs of Fleurosigma formosum. 



New Fellow ; — The following was elected an Ordinary Fellow 

 C. n. JolUtfe. 



Meeting or 14th Novembeb, 1888, at King's College, Strand, W.C. 

 THE Eev. Dr. Dalltnger, F.E.S., Vice-President, in the Chair. 



The Minutes of the meeting of 10th October 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 



Mawer, W., Primer of Micro-petrology, 68 pp., 26 figs. (8vo, Lon- 

 don, 1888) The Author. 



Slide of Naticula venustissima n. sp. Mr. F. Kitton. 



Mr. Crisp exhibited a portable Microscope in a very heavy brass box 

 which came from Vienna, the design being good, and closely resembling 

 one brought out some years ago by Mr. Collins, but having a wood case. 

 The disadvantage of a case made of such stout brass was apparent, 

 seeing that it added so greatly to the weight of the whole that it could 

 hardly be regarded as portable. 



Mr. C. D. Ahrens' gigantic Microscope was exhibited. Mr. Mayall 

 explained that Mr. Ahrens having invented a polarizer with a large field, 

 had designed this Microscope for use in connection with it. The very 

 large eye-piece gave a field of considerable diameter, but unfortunately 

 it was only achromatized for the centre of the field, the outer portions 

 showing colour in a very marked degree. The correction was also very 

 imperfect for flatness of field, so that if a slide of fine writing were 

 examined it could only be read across the centre of the field, the outer 



