u 



PROCEEDINGS 



OF THE 



QUEKETT MICROSCOPICAL CLUB. 



At the 536tli Ordinary Meeting of the Club, held on October 8tli, 

 1918, the President, Dr. A. B. Rendle, F.R.S., in the chair, the 

 minutes of the meeting held on June 11th were read and con- 

 firmed. Eight nomination forms were read for the first time. 

 Professor G. S. West, M.A., D.Sc, F.L.S., Mason Professor 

 of Botany, University of Birmingham, was elected an honorary 

 member of the Club. 



Two papers, one by Mr. E. M. Nelson, on " The Binocular 

 Microscope," and one by Mr. F. Oxley, on " The Magnifying 

 Power of a Microscope and Some Methods of ascertaining it," 

 were read in title. 



Dr. Rendle exhibited a specimen of a Himalayan Aroid {Sauro- 

 matum guttatum). Attention was drawn to its resemblance to 

 our British arum {A. maculatum) or Cuckoo-pint. The leaves 

 of the plant exhibited are pedately divided on tall, stout, oftea 

 mottled stalks, appearing after the spadix. 



Mr. Grundy then read a paper by Mr. A. Ashe describing an 

 incandescent gas lamp which he had devised for microscopical 

 use. The object of the lamp is to provide a more concentrated 

 light than that afforded by the ordinary mantle, and also to get 

 rid of the pattern of the mesh that is so objectionable when the 

 mantle is in focus. The burner found most suitable is a two- 

 hole fish-tail acetylene burner, such as Bray's 00000, burning 

 about one cubic foot of gas per hour. The incandescent cylinder 

 is carried by a platinum or nickel wire lying in the same plane 

 as the gas flame, and having its free end towards the observer, 

 and bent up at an angle of 45°. The cylinders are made by 

 cutting an ordinary upright mantle into strips about 1/4 inch 

 wide and 2 in. or more long, rolling them round a knitting 

 needle or smooth wire and securing the end by moistening it 



