335 



PROCEEDINGS 



OF THE 



QUEKETT MSCROSCOPiCAL CLUB. 



At tlie 563rd Ordinary Meeting of tlie Club, held on October llth, 

 1921, tbe President, Dr. A. B. Rendle, M.A., F.R.S., in the chair, 

 the minutes of the meeting held on June Idth, 1921, were read 

 and confirmed. 



Messrs. J. Adam Guthrie, Ed. Montague Hardy and D. Sydney 

 Martin were balloted for and duly elected members of the Club. 

 Twelve nominations were read for the first time. 



The President announced that Dr. E. Penard had presented to 

 the Club a copy of his book, Etudes sur les Infusoires d'eau douce. 

 A vote of thanks was accorded to Dr. Penard for his valuable 

 donation. The Hon Secretary distributed to the members a 

 programme of the chief papers for the meetings till the end of the 

 year. Mr. F. Addey would read a paper on " Pinus sylvestris " 

 on November 8th, and Mr, T. E. Wallis would give a lecture on 

 December 13th on " Microscopy as an Aid to Analysis." A list of 

 apparatus for sale that had belonged to the late Dr. Spitta was 

 also distributed, and a note read from Mr. Pearsall stating that 

 he could supply tubes of plankton from the English lakes. Mr. 

 Earland very kindly brought for distribution a supply of for- 

 aminiferous material. Mr. N. E. Brown exhibited some specimens 

 and draAvings of the South African species of Hydrodictyon 

 (Water-net), which had been found in 1912, but not again until 

 this year. The Hon. Secretary read a note by Mr. E. M. Nelson 

 describing a polariscope which was a modification of one made 

 by Mr. Wood. The polariscope consists practically of two bundles 

 of glass plates and a mirror. The light enters and leaves the 

 apparatus in the same line, so that the polariscope may be 

 easily rotated. Two bundles each of eight glass plates are set at 

 the polarising angle so that the light is reflected from one bundle 

 down to a silvered mirror, then up again to the other bundle 

 and out of the apparatus. In this way it is possible to make 

 a very practical polariscope which will completely fill the back 

 lens of a large substage condenser. By loosening two screws 



