XVIII, 2. Neue Literatur. 255 



b. Ocular. 



Henocque, Oculaire spectroscopique destine aux etudes de micro-spectro 

 scopie (Comptes Rend. Soc. de Biol. t. LH, 1901, no. 37, p. 1009). 



c. Beleuchtungsapparate. 



Bausch and Lomb's duplex substage (Journ. R. Microsc. Soc. 1901, pt. 1, 

 p. 82; vgl. Journ. applied Microsc. vol. III, 1900, p. 933). 



Electric focus lainp for the microscope (Journ. R. Microsc. Soc. 1901, pt. 1, 

 p. 8G). 



d. Polarisationsapparate. 



Pattersou, W. L., A combined condenser and polarizer for petrographical 

 microscopes (Journ. applied Microsc. vol. IV, 1901, no. 2, p. 1155). 



(Rheinberg, J.,) Imitation of polarized light effects by difl'raction (Journ. 

 R. Microsc. Soc. 1901, pt. 1, p. 87 ; vgl. Journ. Quekett Microsc. Club 

 vol. VII, 1900, p. 407). 



e. Camera lucida. 



Ashe's camera lucida (Journ. R. Microsc. Soc. 1901 , pt. 1 , p. 84 ; vgl. 



Journ. Quekett Microsc. Club vol. VII, 1900, p. 413). 

 Koristka's Abbe camera lucida (Journ. R. Microsc. Soc. 1901, pt. 2, p. 206). 



f. Verschiedenes. 



Forgan , W. , Simple method of obtaining a large field of view with the 

 Compound microscope (Proceed. Scottish Microsc. Soc. vol. III, 1901, 

 p. 32). 



Nelson, E. M., On tube length (Journ. R. Microsc. Soc. 1901, pt. 2, p. 123). 



Gilberton's microscope (Journ. R. Microsc. Soc. 1901, pt. 1, p. 82). 



