934 PROCEEDINGS OF THE SOCIETY. 



board. Mr. Mayall exhibited the camera lucida in operation after 

 tbe meeting, and it was generally acknowledged to be a marked 

 improvement upon other forms of camera lucida hitherto made. 



Mr. R. Brown, jun.'s, description of his Slide-box was read 

 (ante, p. 923). 



Mr. Crisp called attention to the programme of the twelfth Annual 

 Conversazione of the Chester Society of Natural Science as being 

 admirably arranged. 



The President read the following letter from the Secretary of the 

 American Society of Microscopists, and the President was requested 

 to convey the thanks of the Society for the compliment. 



Buffalo, N.Y., Sqyt. 19th, 1883. 

 My dear Sik, — It is my pleasure to inform you that at the late 

 Annual Meeting of the American Society of Microscopists, a resolu- 

 tion offered by Dr. Geo. E. Blackham was adopted as follows : 

 Eesolved, — That the American Society of Microscopists recognizes 

 and reciprocates the kindly fraternal feeling shown by the Royal 

 Microscopical Society in making our President an ex-officio Fellow ; 

 and that as a further evidence of appreciation and reciprocal feeling 

 we hereby elect the President of the Royal Microscopical Society and 

 his successors ex-officio Honorary Members of this Society. 



Yours respectfully, 



D. S. Kellioott, 

 Prof. P. Martin Duncan, Secretary, American Society of 



President of the Royal Microscopical Society, Microscopists. 



London, England. 



Mr. Crisp said that Dr. Blackham's resolution, according to the 

 ' Chicago Times ' of the 9th August, was prefaced as follows : " In 

 view of the fact that the Royal Microscopical Society of London has 

 seen fit to honour this Society by making its President a Fellow of 

 that Society, it seems fitting that there should be some formal recog- 

 nition on our part of the honour thus conferred by the oldest and 

 most distinguished national Microscopical Society upon the youngest. 

 I therefore move, &c." 



Mr. Crisp reported the decision of the Committee of the American 

 Society of Microscopists on Standard Eye-pieces [ante, p. 711). He 

 said that he was afraid that the Committee had been somewhat misled 

 upon a point of optical theory by the Table of Magnifying Powers 

 published in the Journal. This Table had now been withdrawn, and 

 he had prepared a paper, which there was not time to read at this 

 meeting, explaining the source of the erroi-. 



Mr. Squire's paper " On a Method of Preserving the Fresh-water 

 Medusa " was taken as read, having been received during the vacation 

 and printed in the Journal {ante, p. 485). Specimens of MedusaB 

 preserved in the manner described in the paper were now exhibited. 



