PROCEEDINGS OF THE SOCIETY. 253 



On the same evening in the Lecture Hall was held a General 

 Discussion on 



The Mechanical Design and Optics of the Microscope. 



Professor John Eyre, M.D., M.S., etc., President of the Royal 

 Microscopical Society, opened the proceedings with a short Address. 



Mr. J. E. Barnard gave a " General Survey," which was followed by 

 ■abstracts of the following papers on Ihe 



Mechanical Design of the Microscope. 



(a) General. 



Professor F. J. Cheshire, C.B.E., " The Mechanical Design of 

 Microscopes." 



Mr. Conrad Beck, C.B.E., "The Standard Microscope." 



Mr. F. W. Watson Baker, " Progress in Microscopy from a Manu- 

 facturer's Point of View." 



Mr. Powell Swift, " A New Microscope." 



Sir Robert Hadfield, Bart., D.Sc, F.R.S., President of the Faraday 

 Society, then took the Chair during the reading of the abstracts of the 

 following papers : — 



(b) Metallurgical. 



Dr. W. Rosenhain, F.R.S., "The Metallurgical Microscope." 

 Professor Cecil H. Desch, D.Sc, " The Construction and Design 



of Metallurgical Microscopes." 

 Mr. E. F. Law, " The Microscope in Metallurgical Research." 

 Mr. H. M. Sayers, " Illumination in Micro-metallography." 



(c) Petrological. 



Dr. J. W. Evans, F.R.S., " The Requirements of a Petrological 

 Microscope." 



A discussion followed on the foregoing papers. 



Mr. Robert S. Whipple, President of the Optical Society, then took 

 the Chair during the reading of abstracts of the following papers on the 



Optics of the Microscope. 



Professor A. E. Conrady, " Microscopical Optics." 



Dr. H. Hartridge, M.A., "An Accurate Method of Objective 



Testing." 

 Mr. H. S. Ryland, " The Manufacture and Testing of Microscope 



Objectives." 

 Mr. F. Twyman, " Interferometric Methods." 



A discussion followed on the foregoing papers. 



A full report of the proceedings will be published in connexion with 

 the report of the Symposium held on January 14, 1920. 



