XX, 4. Neue Literatur. 499 



g. Lupe. 



Blakesley, Th. H., Single-piece lenses (Proc. Phys. Soc. London vol. XVIII, 



1903, p. 591). 

 M., Die neue Binocular-Lupe von E. Leitz, Wetzlar (Zeitschr. f. angew. 



Mikrosk. Bd. IX, H. 11, 1903, p. 291). 

 Koristka's kand-inagnifiers (Journ. R. Microsc. Soc. 1903, pt. 4, p. 548). 

 Leitz' hand-loups (Journ. R. Microsc. Soc. 1903, pt. 6, p. 761). 



h. Verschiedenes. 



(Barus,) Method of demonstrating Newton's colours by transmitted light 



(Journ. R. Microsc. Soc. 1903, pt. 5, p. 672; vgl. Americ. Journ. Sei. 



v.J. XV, 1903, p. 224). 

 Chabrie, C, Sur le principe de la construetion d'un appareil d'optique 



destine ä obtenir de tres forts grossissements (Comptes Rend. de 



l'Acad. des Sc. de Paris t. CXXXVIII, 1904, p. 265). 

 Chabrie, C. , Sur la fonetion qui represente le grossissement des objets 



vus ä travers un cone de cristal (Comptes Rend. de l'Acad. des Sc. 



de Paris t. CXXXVIII, 1904, p. 349). 

 Conrady, W. A. E., Numerical aperture and rapidity (Journ. R. Microsc. 



Soc. 1903, pt. 6, p. 765; vgl. Knowledge vol. XXVI, no. 216, 1903, 



p. 236). 

 Dokulid, Th. , Die Bestimmung der optischen Constanten eines centrirten 



sphärischen Systems mit dem Präcisionsfocometer (Der Mechaniker 



Bd. XII, 1904, p. 37). 

 Everett, J. D., On skew refraction through a lens; and on the hollow 



pencil given by an annulus of a very obliquely placed lens (Proc. 



Roy. Soc. vol. LXXI, 1903, p. 509). 

 Everett, J. D., On the resolving power in the microscope and telescope 



(Rep. British Assoc. Glasgow 1901, p. 569). 

 Fery, Ch., Methode nouvelle pourla determination des constantes des lentilles 



(Bull. Soc. frang, de Physique 1903, p. 226). 

 Gordon, J. W. , The Helmholtz theory of the microscope (Journ. R. 



Microsc. Soc. 1903, pt. 4, p. 381). 

 Hovestadt, H. , Jena glass and its scientific and industrial applications. 



Translated and edited by J. D. Everett, M. A. , J. R. S. , and Alice 



Everett, M. A. London (Macinillan & Co.) 1903, XIV a. 419 pp., 



29 figs. 

 Kleiber, J., Astigmatismus bei Hohlspiegeln (Zeitschr. f. Unterr. Bd. XVI, 



1903, p. 208). 

 (Leiss, C.,) Ueber eine neue Camera zur stereoskopischen Abbildung mikro- 

 skopischer und makroskopischer Objecte (Zeitschr. f. Instrumentenk. 



32* 



