34 CORRESPONDENCE. 



November last, it was decided among other things that original 

 members, who shall have been members of the provisional committee, 

 or founders, to the number of 250 — entrance fee, two guineas. Annual 

 subscription : town members, two guineas ; country members, one 

 guinea. Members entering after the club is founded — entrance fee, 

 four guineas. Annual subscription : town members, three guineas ; 

 country members, one guinea and a half. Although these fees are 

 small when compared Tvith those of other clubs, a large number of 

 members will furnish an ample income for an economically conducted 

 and moderate establishment. When the requisite number of names 

 has been received, a general meeting will be called to formally found 

 the club, but until then it is not proposed to incur any beyond very 

 trifling preliminary expenses. Gentlemen sending in their names to 

 be added to the provisional committee will consequently be under no 

 pecuniary or other liability. It is therefore hoped that the projjosal 

 may meet with the general supjjort of scientific meil, and that thus a 

 scientific societies' club may be successfully established. There have 

 been already more we learn than a hundred members, so that we trust 

 soon to hear that the lists have been quite filled up. Gentlemen who 

 are desirous of joining will please forward their names to us, when 

 we shall be happy to communicate to them any facts or information 

 regarding the club which they may require. 



COREESPONDENCE. 



Cements. 



To the Editor of the ^Monthly Microscojncal Journal.'' 



Dear Sir, — In the report of the microscopical meeting of the 

 Brighton Society the subject of discussion was "Cements." As I 

 have made many experiments for the purpose of discovering a perma- 

 nently adhesive material, I may perhaps be allowed to make a few 

 remarks on the subject. For di-y mounting, where only very shallow 

 cells are required, I have found nothing better than asphalte dissolved 

 in benzole, with a small quantity of gold size added. The cells 

 should be made by the addition of successive layers of varnish, each 

 layer to be hardened before the next is put on. When thick enough, 

 the slides should be placed in a cool oven and allowed to remain all 

 night. In order to attach the cover, I put a fresh layer of asphalte 

 (without gold size) on the surface of cell, and allow it to remain 

 exposed five or six minutes. The cover may now be placed upon it, 

 and pressed upon the cell by a slide, previously heated to ensure perfect 

 contact, and it may now be finished off with an exterior ring of the 

 asphalte (No. 2) ; or if it is wished to put a coloured ring or rings 

 round it, a layer of ordinary shell-lac varnish should be run round it 

 before using them. I have found the dammar cement, made by Mr. 

 W. White, of Litcham, the best medium for mixing the colours with ; 



