848 PROCEEDINGS OP THE SOCIETY. 



diffraction theory itself; but only to certain conclusions which some 

 persons had drawn from it. 



Mr. T. F. Smith read a paper " On the Ultimate Structure of the 

 Pleurosigma Valve " (supra, p. 812). 



Prof. Bell said he was disappointed to find that a sjiecimen which he 

 had brought for exhibition at the meeting was dead. It was a fine 

 specimen of Virgularia mirahilis, which had been sent to him by post 

 from the west coast of Scotland by Mr. Gathorne Hardy. He had to 

 attend a committee during the afternoon, and, having the tube in his 

 pocket, the warmth had proved too much for it, and it had broken up 

 and disintegrated. He regretted that he was in consequence unable to 

 show what was certainly a very interesting and beautiful organism, so 

 that for the moment they would have to be content with the knowledge 

 gained by his experience, namely, that it was now possible to get living 

 specimens delivered in London from Scotland in a healthy condition by 

 the parcel post. 



The foUowins^ Instruments, Objects, &c., were exhibited; — 



Prof. Bell : — Virgularia mirahilis. 



Dr. Hudson : — Three Photomicrographs of GompJiogaster areolatus. 



Mr. J. Meade : — Stereoscopic Photomicrograph of head of Crane Fly. 



Mr. Nelson : — Baker's Student's Microscope with new elementary 

 centering Substage. 



Mr. Eousselet : — Limnias cornuella. 



Mr. T. F. Smith : — Valve of Pleurosigma formosum in illustration of 

 his paper. 



Mr. Western : — Rotifer citrinus. 



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

 Surg. P. W. B. Smith, E.N. ; and Surg. V. Gunson Thorpe, E.N. 



Meeting of 13th Nov., 1889, at King's College, Strand, W,C., 

 THE President (Dr. C. T. Hudson, F.E.S.) in the Chair. 



The Minutes of the meeting of 9th October 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 

 Behrens, W., A. Kossel, and P. Scliiefferdecker, I'as Mikroskop 



unci die Methoden der mikroskojjischen Untersuchung. 



Band i.,viii. and 315 pp., 193 figs. (8vo, Braunschweig, 1889) Br. W. Behrens. 

 Dowling, C. H., Series of Metric Tables Mr. Crisp. 



The Rev. Henry Armstrong Hall said that he had brought for ex- 

 hibition a preparation which he thought would be found of interest. In 

 January of the present year Dr. Bnllock — who was at the meeting that 



