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PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 21st of February, 1900, at 20 Hanover Square, W.» 

 The President, W. Carruthers, Esq., F.R.S., in the Chair. 



The Minutes of the Annual Meeting of January 17th, 1900, were 

 read and confirmed, and were signed by the President. 



The List of Donations to the Society (exclusive of exchanges and 

 reprints) received since the last Meeting was read, and the thanks of the 

 Society were voted to the donors. 



From 

 H. W. Conn, The Story of Life's Mechanism. (8vo, London, \ „,, p ,, . , 



The Illustrated Annual of Microscopy, 1900. (8vo, London, 1900) The Publishers. 

 A " Jones' Most Improved combined Microscope and Apparatus'' Mr. E. M. Nelson. 



With reference to the Jones' Microscope, Mr. Nelson said it was one 

 of Jones's Most Improved patterns, and would be specially interesting 

 because hitherto the Society had possessed no example of this instru- 

 ment in its collection. The exact date of this instrument was a little 

 uncertain, but he believed it to be about the last improvement made in 

 the non-achromatic Microscope. The first published description of this 

 Microscope, with a figure, is to be found in Adams' Essays on the Micro- 

 scope, 1798. 



Dr. J. W. Measures said he had been announced to give an exhi- 

 bition of photomicrographic and projection apparatus, but he did not 

 propose to detain the Meeting with any lengthened remarks on the ap- 

 paratus made use of. Those who had examined it would readily under- 

 stand that the arrangement would suffice both for photographic purposes 

 and for projection. The camera was fitted with bellows divided into two 

 parts, of which the front portion could be used separately, or both parts 

 could be coupled together, when a considerably greater extension was 

 available. It was fixed on a strong iron stand with levelling screws in 

 the feet, and, being very firm, no inconvenience had been found to arise 

 from vibration in consequence of the Microscope and illuminating appa- 

 ratus being on one table and the camera on another. The lamp used 

 was one of considerable power, being supplied with a continuous electric 

 current of 65 volts and 30 amperes. All other parts required for illu- 

 mination, such as condenser, water-chamber, iris diaphragm, &c, wore 

 fitted upon saddles sliding upon a prismatic steel rail in front of the 



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