PROCEEDINGS OF THE SOCIETY. 215 



The following were exMbited :— 



Mr. Baclcock : — Three lithographs of Infusoria on a black ground, 

 illustrating a new method. 



Mr. T. J. Parker : — Slides of Copepoda, prepared \ntb. osmic acid. 



Mr. Stephenson : — (1) Five forms of his catoptric immersion illu- 

 minator, viz. : — 



Three of 1-inch, ^-inch, and ^-inch radius, as described in this 

 Journal, vol. ii. p. 36. 



A cylindrical illuminator of 1-inch radius on the same principle. 



A fifth consisting of two lenses, a meniscus and plano-convex, the 

 curvature of the latter coinciding with the curved surface of the 

 former, so that the achromatism is preserved whilst there is no inter- 

 ference with the power of total reflection at the surface where the 

 film of air between the lenses intervened, 



(2) The following photographs taken by Dr. Woodward (lent by 

 Professor Abbe) : — 



Amph'ipleura pellucida, in balsam. Zeiss' ^^ '^^ immersion (2630 

 diameters). 



Same valve. Zeiss' ^ oil immersion, with Tolles's amplifier 

 (2500 diameters). 



Same valve. Powell and Lealand's gV ^ater immersion (2780 

 diameters). 



Same valve. Powell and Lealand's new ^ water immersion 

 (2565 diameters). 



Same valve. Spencer's -^ glycerine immersion, with Tolles's 

 amplifier (2440 diameters). 



Pleurosigma angulatum (hexagons). Zeiss' ^^ oil immersion (2400 

 diameters). 



Same (difiraction lines — Abbe's experiment). Zeiss' \ oil im- 

 mersion (1700 diameters). 



Mr. Ward: — (1) Sections (double stained) of stem of Gulancha 

 (Tinospora cordifolia). (2) Sections (double stained) of stem of 

 Bhipsalis Cassytha (Cactacefe). 



Mr. Crisp:— (1) Baker's "Model" histological Microscope. 

 (2) Beck's small binocular Microscope on the " Economic " principle, 

 with American glass stage. (3) Crouch's "Alpha" school Micro- 

 scope, with dividing object-glass. (4) Professor Mobius's elaborate 

 treatise on " The Structure of Eozoon Canadense." (5) The prepara- 

 tions of whole insects of Herr Petzold, of Vienna, described in 

 ' Nature,' vol. xix. (1879) p. 301, and lent by the editor. 



New Fellows. — The following were elected Fellows of the 

 Society, viz. : — Messrs. T. Brown ; L. Dreyfus ; C. A. Lucas ; W. M. 

 Marshall J.P. ; and T. J. Parker, Assoc. E.S.M. 



