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PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 18th June, 1913, at 20 Hanover Square, W., 

 Professor C Sims Wood head, M.D., etc.. President, in 

 the Chair. 



The Minutes of the Meeting of May 21, 1913, were read, confirmed, 

 and signed by the President. 



The List of Donations (exclusive of exchanges and reprints) received 

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

 were accorded to the donors : — 



From 



Two Grayson Rulings Mr. Conrad Beck. 



Hall, Rev. C. A., F.R.M.S., Pond-life Messrs. A. and G. Black. 



Mr. A. W. stokes demonstrated a new method of electric lighting 

 by means of a small flash-light dry cell fixed to .the base of the 

 Microscope. This lighted a minute Osram 4 candle-power lamp which 

 slid on a movable arm attached to the limb of the Microscope, so that 

 it could give transparent, obhque, or opaque illuminations as desired. 

 No movement of the Microscope would cause the light to be lost ; the 

 current would only be used while actually viewing the object. Hence, 

 a cell costing 4:^d. would last out two ordinary Soirees, and the whole 

 apparatus could be made for 15s. 



The President said Mr. Stokes' instrument might prove useful for 

 demonstration purposes, where the difficulties of maintaining the light 

 in one position were often so great. 



Mr. Hamilton Hartridge remarked that one of the additional uses 

 of the apparatus was in work on diatoms, under very high power 

 microscopy, when it was essential to have all light excluded from the 

 room as far as possible. Under such conditions he had himself proved 

 Mr. Stokes' lamp to be extraordinarily useful. 



The hearty thanks of the Society were accorded to Mr. Stokes for 

 his interesting exhibit. 



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