040 PROCEEDINGS OF THE SOCIETY. 



they could not use eye-piece power higher than 6 or 8, he thought 

 they would hardly be able to agree with it from a practical point of 

 view. In examining double stars for instance, it was well known that 

 when an ordinary deep eye-piece failed to resolve the object, a deeper 

 one would reveal the double star to perfection. So also with the 

 Microscope ; it was a fact that with a deep eye-piece they could often 

 make lines visible which could not be seen with one of less dej^th, 

 and he had found that with a certain eye-piece of double the C power 

 he could see lines on Nobert's plate which were otherwise entirely 

 invisible. He thought this was a matter in regard to which, in the 

 face of practical experiences, mathematicians would have to step on 

 one side. He saw that Dr. Schroder proposed to make an eye-piece 

 of l-4th inch focus, and he was quite sure that Dr. Schroder had it 

 in his mind to make something that should be of some service. 

 Therefore he could only say that he thought Professor Abbe had 

 placed his powers at too low a figure. 



Dr. Anthony said he could emphatically endorse the remarks 

 which had been made. Every microscopist knew by experience 

 which of his battery of eye-pieces suited his purpose the best, ac- 

 cording as he wanted to see the relative position of the parts of a 

 structure, and if he wished to see through several planes he would 

 go on using his eye-pieces until his objective " broke down " ; but if 

 they had an objective which would bear the deeper eye-pieces, C, D, 

 and so on, they knew that they were able to get a great power of 

 separation, and then found that there were thousands of lines which 

 could not be appreciated before because they were not grasped by the 

 eye-piece. 



Mr, J. Deby's paper " On the Mineral Cyprusite " was taken as 

 read. 



The following' Instruments, Objects, &c., were exhibited: — 



Mr. Beck : — Pathological Microscope and Condenser. 



Mr. Curties : — Ayl ward's Collecting Apparatus. 



Mr. Crisp : — (1) Geneva Society's Microscope, and movable Table 

 for drawing with the Camera Lucida. (2) Harris's Pocket Microscope. 

 (3) Swift's Pocket Microscope. (4) Millar's Multiple Stage-plate. 

 (.5) Matthews' and Watson's Adapters for Objectives. (6) Bausch 

 and Lomb Optical Co.'s Compressors. (7) Abbe's Analyser. (8) 

 Valentin's Hot Stage. (9) Zeiss's Micrometer Eye-piece. 



Mr. J. Mayall, jun. :— Schroder's Pocket-lens. 



Mr. Stewart : — Safety Stage. 



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

 Messrs. Benjamin Braman, William Haynes, James Hulrae, Edward 

 D. Marriott, W. T. Moffat, Henry G. Plimmer, M.K.C.S., and John 

 T. Thompson. 



Walteb W. Eeeves, 

 Assist.-Secretary. 



