VIII, 4. Neue Literatur. 



553 



Turner, E. H., On the difference between the visual and actinic foci of 

 microscopical objectives (Manchester Microsc. Soc. Transact. a. ann. Rep. 

 1890 p. 80). 



c. Stativ. 



(Pfeffer, W.,) New liot stage and accessories (Journ. R. Microsc. Soc. 1891 



pt. 4 p. 521 ; cfr. diese Zeitschr. Bd. VII, 1890, p. 433). 

 New objective changer (Journ. R. Microsc. Soc. 1891 pt. 4 p. 519 ; cfr. Central- 



zeitg. f. Opt. u. Mechan. Bd. XII, 1891, p. 46). 



d. Beleuohtiingsapparate. 



(Brünnee, R.,) On a new arrangment in microscopes for the rapid change 



from parallel to convergent light (Journ. R. Microsc. Soc. 1891 pt. 4 p.519; 



cfr. Zeitschr. f Instrumentenk. Bd. XI, 1891, p. 136 ; diese Zeitschr. Bd. VIII, 



1891, p. 335). 

 Nelson, E. M., A new illuminating ai^paratus (Joilrn. R. Microsc. Soc. 1891 



pt. 4 p. 443). 

 (Sohielferdecker, P.,) Die Kochs- -WoLz'sche Mikroskopirlampe (Zeitschr. f. 



Instrumentenk. Bd. XI, 1891, H. 8 p. 304; cfr. diese Zeitschr. Bd. VII, 1890, 



p. 450, Bd. VIII, 1891, p. 53). 

 (Schiefferdecker, P.,) Kochs-Wolz improved microscope lamp (Journ. R. 



aiicrosc. Soc. 1891 pt. 4 p. 520; cfr. diese Zeitschr. Bd. VII, 1890, p. 450). 



e. Testobjecte. 



(Cox, J. D.,) Diatom-structure. The Interpretation of microscopical Images 

 (Journ. R. Microsc. Soc. 1891 pt. 5 p. 657 ; cfr. Journ. New- York Microsc. 

 Soc. vol. VII, 1891, p. 76). 



Haugliton, C, On the structure of certain diatom-valves as shown by sections 

 of charged specimens (Journ. R. Microsc. Soc. 1891 pt. 4 p. 441). 



f. Verschiedenes. 



(Curtice, C.,) A method of drawing microscopic objects by the use of coordi- 

 nates (Journ. R. Microsc. Soc. 1891 pt. 4 p. 527 ; cfr. Amer. Monthly Microsc. 

 Journ. vol. XII, 1891, p. 52). 



(Czapski, S.,) Die voraussichtlichen Grenzen der Leistungsfähigkeit des 

 Mikroskops (Centralzeitg. f Opt. u. Mechan. Bd. XII, 1891, No. 19 p. 217, 

 No. 20 p. 229; cfr. diese Zeitschr. Bd. VIII, 1891, p. 145). 



Ferrari, G., Ueber convergente und divergente optische Systeme (Centralzeitg. 

 f. Opt. u. Mechan. Bd. XII, 1891, No. 15 p. 169). 



