( 472 ) 

 PEOCEEDINGS OF THE SOCIETY. 



Meeting of 10th Apkil, 1889, at King's College, Strand, W.C, 

 Prof. Charles Stewart, F.L.S., Vice-President, in the Chair. 



The Minutes of the meeting of 13th March last were read and con- 

 firmed, and were signed by the Chairman. 



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 

 Didelot, L., Du Pouvoir Amplifiant du Microscope. 2Qd edition. 



86 pp., and 1 plate. (8 vo., Paris, 1887) Mr. Crisp. 



Messrs, Dick & Swift's new form of Petrological Microscope was 

 exhibited by Mr. Crisp, and the detailed description read to the 

 meeting (supra, p. 432). 



The Chairman thought that the instrument was very ingeniously 

 contrived, and very well adapted to the particular purpose for which it 

 was designed. 



Dr. Van Heurck's communication was read giving the preliminary 

 particulars of a Botanical and Microscopical Exhibition which it was 

 proposed to hold at Antwerp in 1890 in celebration of the 800th 

 anniversary of the invention of the Microscope. Further and more 

 detailed information was promised hereafter. 



Mr. G. Massee's paper on " A Eevision of the Trichiaceae " was 

 taken as read, the Secretary explaining that its length and extremely 

 technical character rendered it impossible for any one but the author to 

 give a resume of it. It would be published in extenso in the Journal, 

 and would be a valuable addition to their proceedings (supra, p. 325). 



Mr. E. M. Nelson's paper on " The Action of the Wide-angled 

 Illuminating Axial Cone and its relation to the Diffraction Theory," was, 

 in the absence of the author, read by Mr. Crisp, many of the illustrations 

 being enlarged upon the board by Prof. Stewart. 



The paper was discussed by the Chairman, Mr. Crisp, Mr. Ingpen, 

 Prof. Lowne, and Mr. T. F. Smith, and will be printed in the next 

 number of the Journal. The discussion occupied the rest of the 

 evening. 



The Chairman announced that the next Conversazione would take 

 place on May 1st. 



New Fellows. — The following were elected Ordinary Fellows : — 

 Messrs. William Gadd, C. W. Hoagland, M.D., and George H. F. 

 Nuttall, M.D. 



