548 Neue Literatur. XI, 4. 



b. Objectivo 



(Piffard,) A suggested method of increasing the numerical aperture of old 

 achromatic objectglasses (Journ. R. Microsc. Soc. 1894 pt. 4 p. 518; vgl. 

 Med. Record vol. XLV, 1894, p. 362). 



c. Tisch. 



(Friedrich, P.,) Heating arrangement of the microscope for bacteriological 

 purposes (Journ. R. Microsc. Soc. 1894 pt. 5 p. 630; vgl. Arbeiten a. d. 

 k. Gesundheitsamt Bd. VIII, 1892; diese Zeitschr. Bd. X, 1893, p. 259). 



Swift's new mechanical stage (Journ. R. Microsc. Soc. 1894 pt. 4 p. 509). 



d. Spectralapparate. 



Wadsworth, F. L. O., Ein neuer Spectroskopspalt mit Doppelbewegung 

 (Zeitschr. f. Instrumentenk. Bd. XIV, 1894, H. 10 p. 364). 



e. Camera lucida. 



KoEisTKA camera lucida after Nachet (Journ. R. Microsc. Soc. 1894 pt. 5 p. 623). 



f. Verschiedenes. 



Backe, F., Kr.EiN'sche Lupe mit Mikrometer (Tschermak's Mineral, u. Petrogr. 



Mittheil. Bd. XIV, 1894, p. 375 ; vgl. diese Zeitschr. Bd. XI, 1894, p. 500). 

 Biese, A. C, Ein neuer Typus optischer Instrumente. Berlin (Selbstverlag) 



1894. 29 pp. 8". 



3. Mikrophotographie. 



(Errera,) La feuille comme plaque photographique (Bull. Soc. Beige de Microsc. 



t. XXI, no. 1—3, 1894, p. 30). 

 Kellermann, W. A., Photographing certain natural objects without a camera 



(The Microscope. new. ser. vol. II, no. 1, p. 6). 

 Lees Curties, C, Apparatus for obtaining instantaneous photomicrographs 



(Journ. R. Microsc. Soc. 1894 pt. 4 p. 516). 

 (Neuhauss, R.,) Comparison between petroleum, gas, and the Aueis incan- 



descent light with respect to their usefulness for photomicrographic work 



(Journ. R. Microsc. Soc. 1894 pt. 5 p. 627; vgl. Internat. med.-photogr. 



Monatsschr. Bd. I, 1894, p. 29 ; diese Zeitschr. Bd. X, 1893, p. 87). 

 Bakek's Photographie microscope (Journ. R. Microsc. Soc. 1894 pt. 4 p. 517). 



