537 



PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the -21st of June, 1!)05, at 20 Hanover Square, W., 

 G. C. Karop, Esq., M.R.C.S., Vice-President, in the Chair. 



The Minutes of the Meeting of the 17th of May, 1905, were 

 read and confirmed, and were signed by the Chairman. 



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 voted to the donors. 



From 

 Braithwaite, E., British Moss Flora, pt. xxiii. (4to, London, "> T] A tl 



Catalogue of Optical and General Scientific Instruments.) Hon. Sec. of the 



(Optical Convention, 1905) / Optical Convention. 



Pocket Botanical and Universal Microscope, by W. and) ,, „ r r, .. 



S.Jones .. . .. ..J ^r-CL.Curiies. 



Wilson's Screw -barrel Microscope (probably by Adams) .. Ditto. 



Old Portable Microscope, by Shuttleworth Ditto. 



Mr. Rousselet described the three old Microscopes presented to the 

 Society by Mr. C. L. dirties— one of which, by Shuttleworth, was of 

 uncertain age, but probably dated from the beginning of the last 

 century ; another was a " Pocket Botanical and Universal Microscope " 

 by W. and S. Jones, which was an improved form of one described by 

 Adams in the first edition of his work on the Microscope ; the third was 

 an old Wilson Screw-barrel Microscope, made probably by Adams in 

 1746. These were all interesting examples of early Microscopes, and 

 were welcome additions to the Society's collection. Figures and descrip- 

 tions of these old Microscopes will appear in a subsequent number of the 

 Journal. 



The Chairman said they were greatly indebted to Mr. Curties for 

 securing these old instruments and presenting them to the Society. In 

 reference to one other donation, he thought they ought not only to 

 thank Dr. Braithwaite, but also to congratulate him upon the completion 

 of his monumental work on " The British Moss Flora," the final plate 

 of which he understood was drawn on his 80th birthday. 



Dr. Lazarus-Barlow exhibited and described a new form of warm 

 stage which could be heated by gas or oil, and in which the regulation 

 depended upon the expansion and contraction of a fixed volume of air. 

 The water form of warm stage he had not found satisfactory. The 

 method of regulation, which was by means of a mercury manometer and 



