650 PROCEEDINGS OF THE SOCIETY. 



Mr. Loy : — Larva of Odonestis potatoria (the Driuker Moth). 



Mr. F. M. Eogers :— Electrical mounting table, described at 

 p. 469. 



Mr. Crisp: — (1) Professor A. de Lasaulx's apparatus for deter- 

 mining the angle of the optic axes of crystals with the Microscope, 

 described at i>. 191. (2) Fresh-water i(i)/s/s from Butfalo, referred to at 

 p. 52, with some undetermined Ehizopods adhering to it (sent by Pro- 

 fessor D. S. Kellicott, of Buifalo). (3) tlroglena volvox (from Mr. Bolton). 



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

 Messrs. H. S. Carpenter, F.C.S., A. C. Cole, J. A. Douglas, Eomyn 

 Hitchcock, G. L. Nichols, J. Stubbins, and T. E. Watson. 



The Presidents for the time being of the following Societies were 

 elected Ex-officio Felloios: — 



Germany. — K. Preussische Akademie der Wissenschaften zu 

 Berlin. (Dresden) K. Leopoldinisch-Caroliuische Deutsche Akademie 

 der Naturforscher. (Miinchen) K. Bayerische Akademie der Wissen- 

 schaften. 



Austria - Hungary. — (Wien) E. Akademie der Wissenschaften 

 (Prag) K. Bohmische Gesellschaft der Wissenschaften. (Budapest) 

 Hungarian Academy. 



Holland. — (Amsterdam) K. Akademie van Wetenschappen. 



Denmark. — (Kjobenhavn) K. Danske Videnskabernes Selskab. 



Sweden. — (Stockholm) K. Svenska Vetenskaps-Akademien. 



Switzerland. — (Ziirich) Allgemeine Schweizerische Gesellschaft 

 fiir die Gesammten Natur wissenschaften (Societe Helvetique des 

 Sciences Naturelles). 



France. — (Paris) Academic des Sciences. 



Belgium. — (Bruxelles) Academic Eoyale des Sciences, des Lettres 

 et des Beaux-Arts de Belgique. 



Italy. — (Eoma) E. Accademia dei Lincei. 



Portugal. — Academia E. das Sciencias de Lisboa. 



Eussia. — Academic Imperiale des Sciences de St. Petersbourg. 



The Ordinary Wednesday Evening Meeting in the Library, 

 on the 18th June, was very numerously attended, to hear Professor 

 Abbe give a demonstration of his "Theory of the Microscope and 

 nature of Microscopic Vision," by the aid of the special apparatus 

 belonging to the University of Jena, devised by him for the purpose. 



The apparatus consists of an objective of about 1 foot focal length, 

 with a condenser of the same power, the illuminating beam from the 

 lamp being in the focal point of the latter, so that parallel rays fall 

 on the objects exhibited, which consist of gratings of various forms 

 ruled on plates of glass coated with a very fine film of lampblack. 

 The instrument, in fact, forms a Microscope of unusually low power, 

 and consequent large scale. The sub-stage was designed some years 

 ago, and was the same in principle as that of Mr. Zentmayer of 

 Philadelphia. Some of the most curious of the experiments were 

 produced by the illuminating beam being made to fall with oblique 

 incidence on the gratings by means of the swinging sub-stage. 



