442 Neue Literatur. IIT, 3. 



Nachet's corneal microscope (1. c. pt. 4 p. 676). 

 Queen's Acme No. 4 microscope (Microsc. Bull. III, 1886, p. 17). 

 Watson-Crossley microscope (Journ. R. Microsc. Soc. Ser. II vol. VI, 1886, 

 pt. 4 p. 670). 



b. Objectiv. 



Detmers, H. J., The numerical aperture of an objective in relation to its 



angle of aperture in air, water, and baisam (Proceed. Amer. Soc. Micro- 



scopists 8tii ann. Meeting 1885, p. 199). 

 Erancotte, M. P., Descriptions des objectifs construits avec les verres nou- 



veaux (Bull. Soc. Beige de Microsc. t. XII, 1886, no. 10 p. 100). 

 CTiindlach , E., On Immersion objectives (Proceed. Amer. Soc. Microscopists 



8tii ann. Meet., 1885, p. 51, p. 236; cfr. Joiu-n. R. Microsc. Soc. Ser. II, 



vol. VI, 1886, pt. 3 p. 510). 



c. Ocular. 



(Gundlach, E.), Astigmatic eye-piece (Joui-n. R. Microsc. Soc. Ser. II vol. VT, 

 1886, pt. 3 p. 509; cfr. The Microscope vol. VI, 1886, p. 63). 



d. Stativ. 



(Ost, J.), Efficiency of the micrometer-screw (Journ. R, Microsc. Soc. Ser. II 



vol. VI, 1886, pt. 3 p. 538; cfr. diese Zeitschr. Bd. II, 1885, p. 295). 

 (Moore, A. Y.), Mechanical stages (Journ. R. Microsc. Soc. Ser. II vol. VI, 



1886, pt. 4 p. 687 ; cfr. The Microscope vol. VI, 1886, p. 80). 

 (Roystou-Pigott, G. W.), Delicate fine focussing adjustment (Engl. Mechan. 



vol. XLIII, 1886, p. 340; cfr. Journ. R. Microsc. Soc. Ser. 11 vol. VI, 



1886, pt. 4 p. 686). 

 (Schiefferdecker, P.,) Ueber eine neue Construction der Mikrometerschraube bei 



Mikroskopen (Centralzeitg. f. Opt. u. Mechan. Bd. VII, 1886, No. 12 



p. 147; cfr. diese Zeitschr. Bd. III, 1886, p. 1). 

 Vorce, C. M., A combined focussing and safety-stage for use in micrometry 



with high powers (Proceed. Amer. Soc. Microscopists 8*1»- ann. Meeting 1885, 



p. 115; cfr. Journ. R. Microsc. Soc. Ser. II vol. VI, 1886, pt. 3, p. 517). 

 Klönne and Müller's diaphragm (Journ. R. Microsc. Soc. Ser. EI vol. VI, 1886, 



pt. 4 p. 680). 

 Schröder differential-screw fine adjustment (1. c. p. 685). 



e. Belexichtung.sapparate. 



(Flescli, M.), Experiments with the electric incandescent and arc lights 

 (Journ. R. Microsc. Soc. Ser. II vol. VI, 1886, pt. 3 p. 513; cfr diese 

 Zeitschr. Bd. I, 1884, p. 561). 



