526 



PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 17th of June, 1908, at 20 Hanover Square, W. 

 A. N. Disney, Esq., M.A., B.Sc, in the Chair. 



The Chairman said they had received a letter from the President, 

 regretting that in consequence of his absence in the country he would be 

 unable to be with them that evening. 



The Minutes of the Meeting of May 20, 11)08, were read. 



Mr. J. W. Gordon said, before the Minutes were confirmed, he should 

 like to suggest an addition to them, as he ought to have mentioned at 

 the last Meeting that the lantern slides of the instruments sent to the 

 Franco-British Exhibition, which were shown on that occasion, were lent 

 for the purpose by Mr. C. Baker. He regretted the oversight, and 

 tendered his apologies to Mr. Curties. 



The addition proposed by Mr. Gordon was then made, and the 

 Minutes, as so amended, were confirmed, and were signed by the Chair- 

 man. 



Mr. J. W. Gordon exhibited a new lens for high-power Microscopy, 

 which had been devised by himself and Mr. H. F. Moulton, the con- 

 struction of which was described with the aid of a sectional diagram 

 shown upon the screen. This lens had been designed to obviate the use 

 of the oscillating screen introduced some time since, the substitute for 

 the oscillating screen being an opaque white screen placed within the 

 objective itself. The optical result of introducing the screen is to pro- 

 duce a large emergent pencil of light the full size of the pupil of the 

 eye. The lens under proper conditions of illumination was capable of 

 producing perfect images in the highest obtainable scale of amplifica- 

 tion. As exhibited at the Meeting, it produced a picture of a Podura 

 scale under a magnifying power of 8000 diameters. 



The thanks of the Meeting were unanimously voted to Mr. Gordon 

 for his communication. 



Mr. Arthur Skinner exhibited a small simple Microscope by Caw. 

 This was only 4f in. high, with a square pillar mounted on a very heavy 

 cylindrical brass stand. It was provided with a plane mirror, 1 in. 

 diameter, and a mechanical stage which worked up the pillar by a focus- 

 ing rackwork, the teeth of which were set obliquely, as in many modern 

 Microscopes. The stage had movements of ' 4 in. horizontally and 

 0*5 in. vertically, and provision was made for the use of condensers 



