APPENDIX I. 



Catalogue of Exhibition, 



Held in connection with 



THE SYMPOSIUM AND GENERAL DISCUSSION 



O N 



The Microscope : Its Design, 

 Construction and Applications, 



On Wednesday, January 14th, 1920, in the Rooms of the Royal Society, 

 Burlington House, Piccadilly. W.l. 



GROUND FLOOR. 



A Selection of Mickoscopes from the Collection in the 

 Science Museum, South Kensington. 



Lent hij the Board of Education. 



The instruments selected are arranged in clironological order, and 

 illustrate the development of the compound microscope from the end 

 of the sixteenth century imtil towards the middle of the nineteenth 

 century. 



Jansen's microscope (1590) is represented by a facsimile copy, 

 and Hooke's microscope (1665) by a photograph of the Plate in 

 his " Micrographia." 



The rest are chiefly examples of the work of the leading English 

 opticians of the eighteenth and early nineteenth centuries, viz., 

 Marshall, Culpeper, Cuff, Martin, Adams, Mann, Watkins, Bleuler, 

 Dollond, Smith, Ross, Powell, Tulley, and Pritchard. 



To mark the introduction of the apochromatic objective a 

 microscope by Zeiss, made in, 1888, is also shown. 



These instruments, which are not the property of the Board, 

 are exlubited by permission of the owners, Mr. Thomas H. Court 

 and Mr. Edward M. Nelson. 



Descriptive labels are shown with the instruments. 



LIBRARY. 



(First Floor.) 



Mr. Charles Baker. — Demonstration of photomicrographic 

 apparatus, equipped for metallurgical research work, ultra-con- 

 denser, concentric dark ground illuminator, and recent introduc- 

 tions of new microscopes and objectives. 



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