149 



•was some uncertainty about tlieiQ. He hoped on another occasion to give them 

 a paper upon this subject. 



Some further discussion then took place between Mr. Ingpen and Mr. Webb 

 as to the cause of the distortion alluded to, eaoh gentleman maintaining his 

 own view, and illustrating the same by illustrations on the black board, and 

 Mr. Webb finally suggesting that if the eyepiece were removed altogether and 

 a film of collodion substituted, the distortion of the object-glass would then be 

 seen increased tenfold. 



Mr. Hainworth supposed that a great deal would depend upon the flatness of 

 the glass upon which the tests were engraved. 



Mr. Webb said he used glass '003, and the spot upon which he engraved was 

 itself so small that he could not conceive of its being otherwise than flat ; at 

 any rate the diamond would penetrate to the same depth only throughout, so 

 that the letters themselv^es would be uniformly flat. 



Mr. Curteis expressed a hope that Mr. Webb would give them his opinions 

 upon Nobert's tests upon some futui'e occasion. 



The President having also expressed a hope that Mr. Webb would do so, pro- 

 posed a vote of thanks for the paper, which was carried unanimously. 



The proceedings then terminated with a conversazione,,at which the following 

 objects were exhibited : — 



Sections of Orange Peel 



,, Cabbage Leaf Stalk 



^Siirs o? Tiresiiis serra ... 

 Micrometer upon Dr. Piggot's principle 



Coccus Aiirantii ... 



Parasitic Moss 



Specimens of Microscopic Writing ... 



Skin of Negro 



Circulation in Water Louse (polarised) 



Attendance— Members, 46 ; 



by Mr. Burch. 



Mr. Curteis. 

 Mr. Ingpen. 

 Mr. Jas. Smith. 

 Mr. J. G. Waller. 

 Mr. Wm. Webb. 

 Mr. T.C. White. 

 Mr. Geo. Williams, 

 visitors, 8. 



January 10th, 1873. — Conversational Meeting. 



Sections of Blow-fly 



Eye of Lobster (section) 



Section of Horse's hoof 



Sections of retina of Frog's eye... 



Peptic glands of proventriculus of Pigeon 



Desmidiaceae (Closterium) 



Spiral vessels of Ehubarb and other objects, 



mounted in a new medium ... 



Rectal papillte of PttZeo; imians 



iepisma sacc/iamia (alive) 



Mosses, &c., polarised 



Sections of foot of Foetus (6 months), and 7 



other Foetal sections 



Chelifer 



Members, 50 : Visitors, 9. 



Mr. Fitch. 



Mr. E. T. Newton. 



Mr. Sigsworth. 



Mr. Slade. 



G. Williams. 



Mr. Oxley. 



Mr. T. C. White. 

 Mr. Golding. 

 Mr. Burch. 



Mr. Daintrey. 



Mr. J. W. Go6dinge. 



