PROCEEDINGS OF THE SOCIETY. 
443 
Dr. L. C. Martin (Optical Engineering Dept., Imperial College of 
Science — Technology). — Diffraction in the Microscope. 
H. W. R. Room, F.R.M.S. — Plumularia echinulata . 
F. Rowley, F.R.M.S. — Diatoms. 
J. Sarvent. — Diatoms from the North Sea. 
C. Tierney, M.S., D.Sc., F.R.M.S. — Sample of contaminated Water 
Supply. 
H. Wood, F.C.S. — Sunstone (opaque object). 
Trade Exhibits were shown in a special room by — 
J. W. Atha & Co. — New Zeiss Stands A and B, with Meyer toothed 
wheel motion. Zeiss Binocular Eyepiece, “ Bitumi.” 
Zeiss Siedentopf Change-over Condenser for trans- 
mitted and direct ground illumination. New 
Apochromat “ X ” for dark ground work. 
Charles Baker. — Microscopes. 
R. & J. Beck, Ltd. — Diphtheria bacillus (dark ground). Amphipleura 
pellucida (1/ 6th in. Apochromatic object glass).. 
Coscinodiscus showing pseudopodia, and Conochilus 
showing cilia extended. Microscopes and Apparatus. 
John Browning. — Micro-Polariscope crystals of organic compounds. 
Cheshire’s Thorium Micro-Gas Lamp. Diffraction 
Grating replicas, etc. 
The Cambridge and Paul Instrument Co., Ltd.— Cambridge 
Rocking Microtome. Cambridge Universal Micro- 
tome. Measuring Microscope and Comparator. 
F. Davidson & Co. — The “ Davon ” Patent Micro-Telescope. Short 
focus Micro-Telescope. The “ Davon ” Super- 
Microscope and Camera. 
The Edison Swan Electric Co., Ltd. — Pointolite Lamps and 
Accessories. 
Flatters & Garnett, Ltd. — Microscopes, Lamps, Microtomes and 
Accessories. 
A. Gallenkamp & Co., Ltd. — Microscopes and Microscopical Acces- 
sories. 
G. T. Gurr. — Stains and Reagents. 
Hawksley & Sons. — N ew Barnard Lamp. 
Adam Hilger, Ltd. — Interference Attachment for testing Rigidity 
and Fine adjustment of Microscope Stands. Appa- 
ratus for Microscopic examination of Profiles 
without necessity of Sectioning. 
Kodak, Ltd. — Wratten Filters. 
Ogilvy & Co. — Leitz Microscopes. Combined Mono-Binocular, 
Binocular, New Greenough Binocular, Portable, 
Petrological and Metallurgical Microscopes. Sub- 
stage Condenser Changers. Photomicrographic 
Apparatus and Microtomes. 
G. N. Part. — Geological Specimens. 
Rheinberg & Co. — Differential Colour Illumination. 
Rudolph & Beesley. — Reichert Microscopes and Accessories. 
