218 



being allowed to elapse between the application of eacb. Some of the slides so 

 prepared bad been in bis possession for fifteen years without any failure of the 

 cement, and without the entrance of an air bubble. Some of them were of large 

 size -i.e., §-in. thick and from 1-in. to l|-in. in diameter. He had also used 

 Bell's cement, which consisted, he believed, of boiled oil, shell lac, and spirit of 

 wine ; that answered very well, and he had a large number of specimens which 

 bad stood for a great many years and were still perfectly tight, and the included 

 specimens in a satisfactory state. Another fact worth mentioning was, that the 

 best results were obtained by using the strongest glycerine for mounting, for it 

 was found that diluted glycerine would get through the cement much more 

 easily than very strong glycerine. 



In reply to a question from the Secretary, the President said that he soaked 

 up any excess of glycerine with blotting paper. It was a good plan to draw a 

 ring roughly upon the glass slide with a common rough diamond point. In this 

 way a kind of trough wa3 formed, into which a little of the cement would run 

 and dry, and it would be found that the cement would adhere with greater tena- 

 city to those parts of the glass which were scratched or roughened than to the 

 polished surface. 



The following objects were exhibited : — 

 Section of Stem of Potamogeton natans by Mr. W. J. Brown. 



Ferri cyanide of Potassium, &c. 

 Gemmiparous conceptacle of Marchantia 



Polyxenus Lagurus (in fluid) 



Falx of Spider 



Circulation of blood in tail of Tadpole 

 Also a portable Microscope 



Mr. Golding. 

 Mr. Jackson. 

 Dr. Matthews. 

 Mr. J. Smith. 

 Mr. Tafe. 

 Mr. Richards, 



May 26th, 1871 — Chairman, Dr. Lionel S. Beale, F.E.S., 



President. 



The following donations to the Club were announced : — 



' ' Land and Water," (weekly) from the Editor. 



" Science Gossip" the Publisher. 



" The Chemist and Druggist" the Editor. 



" The American Naturalist," Nos. 2 & 3., vol. 5 in exchange. 



1 Sbde Mr. Jackson. 



The thanks of the Club were voted to the donors. 



The following gentlemen were balloted for and duly elected members of the 

 dub .—The Revd. Robert Balshaw, Mr. Francis A. Bedwell, Mr. George 

 Browne, Mr. Robert Catchpole, Dr. R. Coales, Mr. Frederick Enoch, Mr. Thomas 

 E. Freshwater, Mr. C. H. Hinton, Mr. John Locke, Mr. John W. May, Mr. 

 Charles Oriel, the Revd. William A. Paxton, Mr. Edward P. Pett, Mr. E. 

 Richards, Mr. J. S. Sigsworth, Mr. Henry Stapleton, Mr. William C Unwin, 

 Mr. James W. Williams. 



Mr. B. D. Jackson described and exhibited to the meeting a new form of 

 paraboloid, on the immersion principle, for which several important advantages 

 were claimed. It differed from the ordinary forms in use by having a slightly 

 concave emergent surface (instead of the usual cup-shaped hollow), which 



