1072 PEOCEEDINGS OF THE SOCIETY. 



Microscope and Prism ; (3) Harting's Quadri-ocular Microscope'; (4) Ahrens's 

 Tri-ocular Microscope ; (5) Eeichert's Mechanical Stage. 



Mr. Crouch : — Dr. Woodhead's Microscope, with large stage. 



Mr. H. F. Dale : — Microtome, with treadle. 



]VIr. Enock : — Hessian Fly and its Parasite. 



Mr. G. M. Giles : — Army Medical Microscope. 



Dr. H. Van Heurck : — Photomicrographs of AmpMpleura pellucida. 



Col. O'ilara : — Photographs of Surirella. 



Mr. Swift : — Platinized Microscope. 



New Fellows: — The following were elected Ordinary Fellows : — 

 Messrs. J. G. Grenfell, F.G.S., W. D. Gunn, C. B. Holland, John Kuther- 

 ford, J.P., and Edward F. Underwood, M.D. 



Meeting of 9th November, 1887, at King's College, Strand, W.C, 

 THE President (the Key. Dr. Dallinger, F.E.S.) in the Chair. 



The Minutes of the meeting of 12th October last were read and 

 confirmed, and were signed by the President. 



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 

 .Nageli, 0., and S. Schwendener, The Microscope in Theory and 



Practice, translated from the German, xi. and 382 pp., 210 figs. 



(8 vo, London, 1887) The Publishers. 



Dr. H. Van Heurck's letter was read, in which he expressed himself 

 satisfied with the result of the discussion at the last meeting relative to his 

 photomicrographs of AmpJiipleura pellucida. 



Mr. E. M. Nelson said he had several matters to bring to the attention 

 of the meeting. The first was a suggestion for supplying a want which 

 many had felt of a really good achromatic single lens or loupe for micro- 

 scopic purposes, of 1/2 in. focus. There were, of course, many such made, 

 and he believed he had tried all, including the achromatics of Steinheil, 

 but he had found them all open to one objection or another. He had, 

 however, found that the want was met by a Seibert No. III. objective 

 having its adapting screw removed. This, when used as a simple lens, formed 

 the best loupe possible. The brasswork might be further turned down in 

 a lathe, and the combination mounted like a Coddington. 



Mr. Nelson further said that having lately obtained an improvement in 

 optical power, he had been able to do a little more in the matter of resolu- 

 tion, and one of the first objects he tried was striped muscular fibre, which, 

 as was well known, offered a good many complexities. In the early days 

 of microscopy a muscular fibril used to be represented as a series of light 

 and dark bands, the dark band being about twice the diameter of the white 

 band. In 1H53 Messrs. Pluxley and Busk discovered a dark stripe in the 

 middle of the bright band, and subsequently Hensen placed a similar 

 darker stripe in the middle of the dark band. With his latest optical 



