( 160 ) 

 PEOCEEDINGS OF THE SOCIETY. 



Meeting of 12th Decbmbek, 1888, at King's College, Strand, W.C, 

 Dr. C. T. Hudson, M.A., LL.D., President, in the Chair. 



The Minutes of the meeting of 14th November 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 

 Colman, W. S., Section Cutting and Staining, vi. and 107 pp., 



6 figs. (8vo, London, 1888) The Author. 



Griffith's Patent Turntable Mr. E. H. Griffith. 



Lubbock, Sir J., On the Senses, Instincts, and Intelligence of 



Animals, with special reference to Insects, xxix. and 292 pp., 



118 figs. (8vo, London, 1888) The Author. 



Whelpley, H. M., Chemical Lecture Notes. 2nd ed., iv. and 



211 pp., 102 figs. (8vo, St. Louis, Mo., 1888) „ 



Zeiss, C, Special-Catalog iiber Apparate fiir Mikiophotographie. 



52 pp., 16 pis., and 9 figs. (4 to, Jena, 1888) „ 



Mr. T. Christy exhibited and described a new device as an attach- 

 ment to a lamp for use with the Microscope. He met with it in the first 

 instance whilst attending the Medical Congress at Cologne, where it 

 attracted a great deal of attention, and was in such demand by the many 

 German visitors that he found it was quite uncertain how long he might 

 have to wait to get one made. He therefore endeavoured to make one 

 for himself, and had done this by inclosing the chimney of an ordinary 

 lamp in a tin tube, into one side of which, on a level with the flame, a 

 short nozzle was inserted. A piece of solid glass rod, about 5/8 in. in 

 diameter, and bent to the required shape, was fitted into this nozzle by 

 passing it through a perforated cork, the other end of the rod curving 

 upwards under the stage of the Microscope. The light from the lamp 

 entering the end of the glass, and being prevented from emerging by 

 the limiting angle, was totally reflected throughout its entire length, and 

 finally escaping at the extremity below the stage, illuminated the object 

 in a very satisfactory manner ; by simply turning the tube the beam of 

 light could be directed upon or through the object in any required 

 direction. He had some difficulty in the first instance in getting any 

 one to undertake its manufacture, from a belief that it was already the 

 subject of an English patent. He foimd, however, on inquiry at the 

 Patent Office, that although a similar lamp had been made about four 

 years ago, and steps had been taken at that time to secure patent rights, 

 the matter had not been taken up within the time allowed, so that it had 

 now lapsed. The intending patentee had wanted it for the purpose of 

 passing light down the throat and elsewhere for medical purposes, but 

 had given it up in favour of the more convenient electric lamp. He was 

 told that in making it there was a good deal to be worked out, because a 

 special sort of glass was needed to secure the best results. It was found 

 that no advantage arose from covering the outside of the glass with tin- 

 foil or black varnish. The German professors found they could work 



