200 PKOCEEDINGS OF THE SOCIETY. 



At the initial meeting of this Committee a Sub-Committee was 

 appointed, composed of the following members : — 



Dr. F. W. Andeews, F.R.S. {Chairman). 



Dr. Andeew Balfoue, C.M.Gr. 



J. E. BA.ENAED, Esq. 



Fleet-Surgeon P. W. Bassett Smith, R.N., C.B. 



Prof. F. J. Cheshiee, C.B.E. 



Dr. John Eyee. 



Hon. Secretaries. 



Sir Alexandee Pedlee, C.I.E., F.E.S. (The late). 

 Dr. F. MoLLWo Peekin. 



The Sub-Committee visited the Works of the principal makers to see 

 what facilities existed for the manufacture of microscopes, and drew up 

 a circular letter, containing questions relating to the types of microscopes 

 most in demand, and the prices which users of such microscopes would 

 be likely to be prepared to pay. This letter was sent to the professors 

 in fifty-four universities and other institutions where microscopes for 

 medical research work are largely used. The replies showed a very large 

 preponderance in favour of certain types. 



As a result of these enquiries, together with the practical experience 

 of the members of the Sub-Committee, certain specifications of the types 

 of microscopes which seemed to be most generally useful were drawn up. 

 These were circulated to the principal manufacturers, and a meeting of 

 the Sub-Committee with these gentlemen was held. At this meeting the 

 points raised were fully discussed, and the manufacturers agreed that 

 the requirements were reasonable. 



The following are the recommendations of the Committee as to the 

 general types of instruments which should be manufactured. 



All screws, threads, tubes and fittings shoidd conform to the Royal 

 Microscopical Societifs standards, noiv verified and deiwsited ivith the 

 Director of the National Physiccd Laboratory. 



Type I.— A cheap instrument under £10, for the use of students. 



1. Stand.— T\iQ modified Continental type, with jug handle; with 

 spiral rack and pinion coarse adjustment. 



2. Tuhe.—^\iovt, with graduated draw tube, allowing for length of 

 nose-piece; the available tube length should be from 140 mm. to 

 180 mm. 



3. Fine Adjustment.— hewer type. Lateral milled heads. 



4. Stage.— Large, square, fair-sized opening, provided with clips of 

 simplest type, having points of contact level with equator of stage. 



