337 



At the meeting of the Club held on November 17th, 1905, 

 the Right Hon. Sir Ford North, F.R.S., Vice-President, in the 

 Chair, the minutes of the meeting held on October 20th were 

 read and confirmed. 



Messrs. Morris B. Evans, B. Karleese, C. H. Brown, J. U. 

 Bremner, T. E. Bonser, A. M. Jones, H. F. Laughton, and the Rev. 

 R. K. Levett were balloted for and duly elected members of the Club. 



After the transaction of the usual business, Mr. H. Taverner, 

 F.R.M.S., described a method of gauging the depths of cells 

 sunk in glass slips, which was also applicable to other forms 

 of cells. In mounting Hydrachnidae without pressure, he had 

 always exj)erienced difficulty in selecting a sunk cell sufficiently 

 deep to hold the object without contact with the cover-glass, 

 and yet sufficiently shallow to prevent the object from moving 

 about. He had found the solution of the problem in a form 

 of engineer's internal depth gauge, which was obtainable at 

 any tool-shop. The slide of the gauge was engraved with a 

 vernier, and the depth of a cell could be read in an instant 

 within -^th mm. The thickness of the object was previously 

 ascertained, either by means of the fine adjustment of the micro- 

 scope where the pitch of the screw was a known quantity, or 

 by turning the object on its edge and comparing its thickness 

 with an engraved scale dropped in the eye-piece. 



The Hon. Secretary said that Mr. Taverner's remarks would 

 prove of great service to many members. He had himself 

 felt the want of such a simple device in mounting Foraminifera. 

 Yery often a cell which seemed amply deep at the time of 

 mounting proved afterwards to be thinner than the object, 

 and the gradual contraction of the cement drew the cover-glass 

 down on the specimen, thus fracturing it. He had lost many 

 good slides in this way. 



The Secretary then said that he regretted to announce that 

 their esteemed President, Dr. E. J. Spitta, was unable to be 

 present, having contracted a severe chill. As they were aware, 

 he had intended to read a paper on " Some Experiments relating 

 to the Compound Eyes of Insects," to which they had all looked 

 forward with great interest. Their Editor, Mr. Frank P. Smith, 

 had very kindly come forward at a few hours' notice to fill 

 the gap, and would give them an ex tempore lecture on " Spiders' 

 Eyes." which would, he felt sure, deserve their closest attention. 



