X, 3. Neue Literatur. 423 



Nelson, E. M., Improved projection microscope (Journ. Quekett Microsc. Club 



ser. 2 vol. V, no. 32 p. 228). 

 Reichert hand-microscope (Journ. R. Microsc. Soc. 1893 pt. 3 p. 381). 

 Reichert microscope (Journ. R. Microsc. Soc. 1893 pt. 3 p. 380). 



b. Objectiv. 



Ebner, V. v., Zur Doppelbrechung der Objective (Internat. Monatsschr. 

 Anat. u. Physiol. Bd. X, 1893 H. 3). 



c. Tisch. 



Reichert movable object-stage (Journ. R. Microsc. Soc. 1893 pt, 3 p. 383). 



d, Beleiichtiingsappärat. 



Reichert's illuminating apparatus (Journ. R. Microsc. Soc. 1893 pt. 3 p. 381). 



e. Verschiedenes. 



(Asche, A.,) Determination of optical tube-length (Journ. R. Microsc. Soc. 



1893 pt. 3 p. 389; cfr. Journ. Quekett Microsc. Club vol. V, 1893, p. 152). 

 de Boeck, J., Procede de technique microscopique applique ä la mesure des 



faibles diflferences de temperature (Bull. Soc. Beige de Microsc. t. XIX, 



1893, no. 5 p. 85). 

 Ingpen, J. E., Note on Wenham's method for obtaining an oblique view of 



a microscopical object and on Marshall's zoophyte trough (Journ. Quekett 



Microsc. Club vol. V, no. 32 p. 223). 

 (Izarn,) Photography of gratings and micrometers engraved on glass (Journ. 



R. Microsc. Soc. 1893 pt. 3 p. 387; cfr. Comptes Rend. de l'Acad. des Sc. 



Paris t. CXVI, 1893, p. 506; diese Zeitschr. Bd. X, 1893, p. 220). 

 Nelson, E. M., Fraunhofer applies bis own diffraction tbeorem to the micro- 

 scope (Journ. Quekett Microsc. Club ser. 2 vol. V, no. 32 p. 232). 

 Nelson, E. M., Note on a new spherometer (Journ. Quekett IMicrosc. Club 



ser. 2 vol. V, no. 32 p. 225). 

 (Salomons, S.,) Optical projection (Journ. R. Microsc. Soc. 1893 pt. 3 p. 383; 



cfr. Proceed. of the Royal Inst. vol. XIII, 1893, p. 534). 

 Schroeder, H. , Ueber die Herstellung genauer Mikrometerschrauben und 



über die Mikrometereinrichtung meiner Spiegelfühlhebel (Zeitschr. f. In- 



strumentenk. Bd. XIII, 1893, H. 6 p. 217). 

 Sohnke, L., Ungevröbnliche mikroskopische Bilder (Sitzber. d. mathem.-phys. 



Gl. d. k. Bayer, Acad. d. Wiss. Bd. XXm, 1893, H. 2 p. 223), 



