( 368 ) 

 PROCEEDINGS OF THE SOCIETY. 



Anntjal Mketing of 11th Februart, 1885, at King's CoLiiEGE, 

 Strand, W.C., the President (the Rev. Dr. Dallinger, F.R.S.) 

 IN the Chair. 



The Minutes of the meeting of 14th January last were read and 

 confirmed, and were signed by the President. 



The List of Donations (exclusive of exchanges and reprints) 

 received since the last meeting was submitted, and the thanks of the 

 Society given to the donors. 



From 

 Stein, S. T. — Das Mikroskop und die mikrographischeTechnik 

 zum Zwecke pliotographischer Darstellung. 2nd ed.. pp. 

 i.-ix. and 151-322, pis. iii.-vi. and figs. 168-302. Svo, Halle 



a. S., 1884 The Author. 



Photographs of Diatoms Dr. J. D. Cox. 



Mr. Stephenson exhibited his new Cata-dioptric Illuminator, which 

 gives an aperture within a small percentage of the refractive index 

 of the glass used. It thus represents approximately the maximum 

 aperture obtainable with any form of illuminator. The reading of 

 Mr. Stephenson's paper was deferred to the March meeting {supra, 

 p. 207). 



Dr. J. D. Cox's further photographs of diatoms were exhibited, 

 and the reading of his accompanying paper (" Structure of the 

 Diatom Shell. Siliceous Films too thin to show a broken edge ") was 

 also deferred to the March meeting. 



Mr. E. M. '^Nelson exhibited one of the lowest priced forms of 

 Leitz's Microscopes, to which he had fitted a simple condenser consist- 

 ing of a meniscus and double-convex lens, which rendered the instru- 

 ment very complete whilst adding but little to its cost {supra, p. 327). 



Messrs. Parkes' 1/16 in. glycerin immersion objective of very 

 moderate price was exhibited, and Mr. Crisp remarked upon the use 

 of glycerin for immersion and the superior advantages which were 

 possessed by oil. 



Mr. Suffolk exhibited the proboscis from a blow-fly which was 

 preserved in glycerin in 1868. It was now mounted in biniodide of 

 mercury and showed the structure of the pseudo- tracheae referred to 

 in Dr. Anthony's letter ante, p. 174. 



Dr. Maddox exhibited some specimens of Dr. Miquel's improved 

 nutritive lichenized paper for the registration and cultivation of 



