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describing an object, exhibited in the room, which had been fished up from 

 a great depth of the sea off Cebu, and the appearance of which he exhibited 

 also by a diagram. He had brought it to ask the opinions of Members as 

 to what it was. His first thought was that it was a piece of Venetian glass, 

 partly decomposed by the action of the sea-water. The effect to which atten- 

 tion was called, was in the interior and not on the surface. 



Mr. Waddington said he had examined it, but could not clearly make out 

 that it was glass at all. He thought if a small portion could be broken off 

 for analysis it could easily be tested as to whether it was glass or not. 



Mr. Priest said he was not sure that it was glass ; it might be a piece of 

 Obsidian. The specimen was in itself so small that he was afraid it would 

 not be possible to spare any for chemical examination. 



Mr. E. M. Nelson read a paper " On the Interpretation of a Pkoto- 

 micrographic Phenomenon by the Abbe Diffraction Theory." 



The thanks of the meeting were voted to Mr. Nelson for his communica- 

 tion. 



Announcements of meetings, &c, for the ensuing month were then made, 

 and the proceedings terminated with the usual conversazione, the following 

 objects being exhibited : — 



Rotifera, Infusoria, &c Mr. F. W. Andrew. 



Marine algae, Chondriopsis tenuissima, &c. ... Mr. T. H. Buff ham. 

 Spermatozoa of mouse (Apochromatic |th) ... Mr. C. Lees Curties. 

 Scales from spider (Salticus scenicus) ... ... Mr. G. E. Mainland. 



Curious object dredged off Cebu Mr. B. W. Priest. 



Lisunocodium Sowerbii ... Mr. C. Rousselet. 



Scale of Morpho Menelaus (torn) Mr. T. F. Smith. 



Muscle of pig „ „ 



Egg of stone mite, Trombidium lapidum ... Mr. A. W. Stokes. 

 Attendance — Members, 47 ; Visitors, 3. 



