92 PROCEEDINGS OF THE 



At the invitation of the Chairman many of the members 

 asked the President questions on various points, to which he 

 replied. Mr. Scourfield said the President had given them a 

 most interesting communication, and the study of the material 

 would afford them plenty of work. Such a paper was quite a 

 new feature in the proceedings of the Club, and a very welcome 

 one. He proposed a very hearty vote of thanks to the President, 

 which was carried by acclamation. 



At the 512th Ordinary Meeting held on December 28th, Vice- 

 President C. F. Eousselet, F.R.M.S., in the chair, the minutes 

 of the meeting held on November 23rd were read and confirmed. 



Mr. John Syer was balloted for and duly elected a member 

 of the Club. 



After the usual preliminary business had been gone through, 

 Mr. J. T. Cook exhibited a novel form of trough for pond life 

 which he had designed, and from considerable use had found 

 very successful. It may be made of almost any size that is 

 desired, but dimensions that can be constructed from the ordinary 

 3 X 1 in. slips are advantageous, as every microscopist has these 

 at hand. Two slips should be taken, and between them an 

 indiarubber ring, such as is used for putting round papers, etc., 

 should be enclosed. It may be left entire with a part projecting 

 above the top of the slips, or a segment can be cut of a suitable 

 size which will lie wholly within their breadth. The ends of 

 the slips are then clipped together by a piece of hard wood, 

 about 1 in. square, in which a groove had been cut of the requisite 

 width to hold together the glass slips and put some slight amount 

 of pressure on the rubber ring, and so prevent leakage. Obviously 

 the ring may be of greater or less thickness, thus varying the 

 capacity of the water space from front to back, while a broad 

 or narrow space can be obtained by its adjustment to suit the 

 purpose in view. Mr. Cook showed a variety of sizes, with differ- 

 ent shapes of internal construction. He stated that among 

 the advantages of this trough are that they are so simple that 

 any one can make them ; cheapness — the cost of the materials 

 being altogether negligible ; ease of cleaning — the only requisite 

 being to slip ofE the wooden clips, when the glasses can be wiped, 

 and all replaced with a minimum of trouble ; and, perhaps 



