XXI, 1. Neue Literatur. 113 



(Dowdy, S. E.,) Focussing safeguard (Journ. R. Microsc. Süc. 1904, pt. 1, 



p. 114; vgl. Eng-lish Mechanic vol. LXXVIII, p. 291). 

 Rudolph, P., Anleitung zur Auswahl der ZEiss-Objektive, 25 pp., 10 Abb., 



4. Ausg. Jena 1903. 

 Trotzewitsch, S. E., Einige Bemerkungen zur Berechnung von Objektiven 



und optischen Systemen überhaupt (Westn. opitnoj fisiki , .SO. sem. 



1903, p. 226). 

 Watson's new „Argus" substage (Journ. R. Microsc. Soc. 1904, pt. 1, 



p. 107 ; vgl. Watson and Sons' special catalogue, p. 7). 

 Watson's Compound substage (Journ. R. Microsc. Soc. 1904, pt. 1, p. 108; 



vgl. W. Watson and Sons' suppleiuental List, October 1903, p. 7). 



e. Okular. 



Nelsons formula oculars (Journ. R. Microsc. Soc. 1904, pt. 1, p. 109; vgl. 

 English Mechanic vol. LXXVIII, 1903, p. 425). 



f. Beleuchtiiugsapparate. 



Dowdy, S. E., Microscope condenser fitting (English Mechanic vol. LXXIX, 



1904, p. 59). 

 (Gray, A. AV.,) Ein leicht herstellbarer Ileliostat (Deutsche Mechan.-Zeitg. 



1904, p. 104; vgl. Zeitschr. f. d. phys. u. ehem. Unterricht Bd. XVII, 



1904, p. 25). 

 Nelson, E. M., On tlie vertical Illuminator (Journ. R. Microsc. Soc. 1904, 



pt. 2, p. 165). 

 Dunning's new portable oil-light lamp (Journ. R. Microsc. Soc. 1904, pt. 1, 



p. 110; vgl. J. Swift and Sons' catalogue, London 1901, p. 45). 

 Heele's Heliostats (Journ. R. Microsc. Soc. 1904, pt. 2, p. 240). 

 Leach's Oxyhydrogen lantern microscope (Journ. R. Microsc. Soc. 1904, 



pt. 1, p. 107; vgl. WooLLEY, Manchester special circular). 

 Swift's light modifier (Journ. R. Microsc. Soc. 1904, pt. 1, ]). HO; vgl. 



J. Swift and Son's catalogue, London 1901, p. 45). 



Zeitschr. f. wiss. Mikroskopie. XXI, 1. 



