178 



of the apparatus necessary for the purpose, so that it may be laid on 

 the stage of the microscope. The necessary pressure being ap- 

 plied by means of a screw, waves and clouds of colour are seen to 

 start out in directions which depend on the amount of force, the ex 

 tent of surface over which it is applied, and the power of resistance. 



QUEKETT MICEOSCOPICAL CLUB. 



DECEMBER 18th, 1868. 

 Arthur E. Durham, Esq., President, in the Chair. 



Tbe minutes of the preceding meeting were read and approved. 

 The following donations were ann lunced : — 



"Science Gossip," from the Publisher; "Land and Water," from the 

 Editor; " Proceedings of the Bristol Natural History Society," from the 

 Society; "The Naturalists' Circular," from the Editor; "The Chemical 

 Geology of the Gold Fields of California" (read before the Royal Society), 

 from the author, Mr. J. A. Phillips ; two slides (Sections of Pearl and Heliopelta), 

 from Mr. Curties ; and a quantity of unmounted microscopical specimens, from 

 Mr. Eldridge. 



The thanks of the members were returned to the respective donors. 

 The following gentlemen were proposed tor membership :— Mr. J. H. Allder, 

 Mr William Brookes, Mr. Alfred Deed, Mr. Basil E. Greenfie'd, Mr. J. Harper , 

 Mr Louis Lewis, Mr. M. Pillischer, Dr. W. H. Sheehy, Mr G. Webb, Mr. C. E. 

 White. 



Sixteen gentlemen, proposed at the previous meeting were then elected by 

 ballot. 



The following objects among others, were announced for exhibition : — 

 Marine Dredgings, by Mr. Curties ; Gemmules of Sponge, by Mr. Groves ; 

 Orchisella pilosa, by Mr. Melntire ; and nine pen and ink drawings, from 

 Microscopical objects, executed by Mr. Hammond, and exhibited by Mr. 

 Moginie. 



Mr. John Hopkinson then read a paper " On British Graptolites," for which 

 the thanks of the meeting were unanimously voted. 



Mr. Samuel Roberts exhibited and described a new form of micrometer. 

 The arrangements for Mr. M. C. Cooke's and for Mr. Suflfolk's classes were an- 

 nounced, and after the usual conversazione the meeting separated 



JANUARY 22nd, 1869. 



Arthur E. Durham, Esq., President, in the Chair. 



The minutes of the preceding meeting were read and approved. 



The following donations were announced : — 



" Science Gossip," from the Publisher ; " The Popular Science Review," from 



