172 PROCEEDINGS OF THE SOCIETY. 



resolved better because of its larger angular aperture, whilst he said that 

 it did so in spite of its aperture. He wished again to repeat that what 

 he desired to express was that if a dry lens of 180° were possible, then 

 it would certainly include the whole of the rays proceeding from any 

 radiant point, and inasmuch as the whole of the rays were included 

 in the 180°, they could not get a lens which would include more than 

 the whole. 



Mr, Stewart made some remarks on the mode in which the 

 diffraction spectra demonstrated the larger aperture of homogeneous- 

 immersion lenses. 



The following Papers and Notes were taken as read, there not 

 being time to discuss them : — 



Professor E. Abbe : — On the true conditions of Stereoscopic and 

 Pseudoscopic Effect in IVIicroscopical Vision. 



Mr. J. C. Douglas : — (1) Silver films for instruments of the 

 Camera Lucida class. (2) Simple device for handling thin covers 

 (see p. 140). Mounting clip (see p. 141). 



Dr. Herpell : — On preserving Fungi (see p. 136). 



Dr. Maddox : — Note on the Aeroconiscope (see p. 134). 



Mr. J. Mayall, jun. : — High Amplifications (see p. 127). 



Mr. Mereschkowsky : — The Movements of Diatoms (see p. 102). 



Mr. Nelson : — Centering nose-piece as a substage (see p. 125). 



Dr. Eoyston-Pigott : — A general and transfer Finder (see p. 115). 



Mr. A. W. Waters : — Dry mounts for the Microscope (see p. 138). 



(Mr. A. D. Michael's paper " On a species of Acarus believed to 

 be unrecorded " was postponed until March.) 



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



Mr. Coppock : — A Microscope constructed in 1878, with the same 

 fine adjustment as that subsequently patented by Mr. Bulloch and 

 described and figured in vol. iii. (1880) p. 1073. 



Mr. Crisp: — (1) Bulloch's Histological Microscope (see Journal, 

 vol. iii. (1880) p. 1079). (2) Bateman's Microscope. (3) Browning's 

 Portable Eotating Microscope. (4) At wood's Kubber Cells (see 

 Journal, vol. iii. (1880) p. 1041). 



Mr. Curties : — Gundlach's ^ Homogeneous-immersion Objective 

 (see p. 120). 



Dr. Koyston-Pigott : — General and transfer Finder (see p. 115). 



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

 Messrs. Richard Andrews, the Hon. Jacob D. Cox, Edward J. E. 

 Creese, John C. Foran, John J. Hunter, John W. Eeed, G. J. Smith, 

 and C. M. Vorce. 



Walter W. Eeeves, 



Assist.-Secretarij. 



