94 



PKOCEEDIXGS OF THE SOCIETY, 



MEETING 



Held on the 17th December, 1913, at 20 Hanover Square, W., 

 Professor G. Sims Woodhead, M.A. M.I)., etc., President, 

 in the Chair. 



The Minutes of the Meeting of November lit, 1913, were read and 

 confirmed, and were signed by the President. 



The List of Donations (exclusive of exchanges and reprints) re- 

 ceived since the last Meeting was read as follows, and the thanks of the 

 Society were accorded to the donors : — 



From 

 Heron-Allen, E., and A. Earland, Foraminifera of the| j,^ Authors 



Clare Island District j 



„ n , .,.-. f Miss Sparks, throuqh 



An Old Microscope \ Messrs. R. and J. Beck. 



Coumarin Sections Mr. G.M. Beaumont. 



_, , , , ..,. v -d i { Messrs. Evershed 



Portable Microscope by Bate <. and Son 



Stevens, Fungi which cause Plant Diseases The Publishers. 



Mr. Watson Baker (for W. Watson and Sons, Ltd.) demonstrated a 

 new Condenser Vertical Illuminator. This apparatus had been devised 

 to overcome the difficulty of setting the illuminant in relation to the 

 vertical illuminator with accuracy. At the same time a condenser 

 system with iris-diaphragms was introduced, which gave the same control 

 in the examination of opaque metal subjects as is obtained with a sub- 

 stage condenser and transparent objects. Projecting from the vertical 

 illuminator itself, and attached to it, was a tube containing the con- 

 denser system, two ivis-diaphragms, and a 4-volt electric lamp, which 

 was lit by a small portable battery. With one iris-diaphragm the illu- 

 mination was controlled, and with the other the field of illumination 

 could be restricted with a nicety, thereby controlling the troublesome 

 glare. With this vertical illuminator it is unnecessary to shorten the 

 mounts of the objectives. 



The thanks of the Society were unanimously accorded to Mr. Watson 

 Baker for his demonstration. 



Mr. R. Finlayson then exhibited a "Circular 12-celled Slide for 

 Opaque Objects," which consisted of a circular piece of mahogany, with 



