IV, 2. Neue Literatur. 277 



b. Oltjeotiv. 



H<>(ljü;-kiiison, A., Ou the diffractiou of microscopic objects iu rclatiou to thc 

 resolviug power of objectives (Proceed. Manchester Lit. and Phil. Soc. 

 vol. XXV p. 263). 



Nelson, E. M., Numerical aperture (Engl. Mechan. vol. XLIV, 1887, p. 480). 



(Schulze, A.), Abbe's apochromatic objectives aud compensating eye-pieccs 

 (Journ. of Anat. vol. XXI, pt. 3 p. 515). 



Taylor, J. T., Photographic lenses (Journ. Soc. of Arts vol. XXXV, 1887, 

 ' p. 192, 268). 



c. Ot'uliir. 



Fkazku's centcring nose-pioce for use with double nosc-pieccs (Journ. R. Mi- 

 crosc. Soc. 1887 pt. 2 p. 294; cfr. Transact. Edinburgh Naturlists' Field 

 Club vol. I, 1885—86, p. 333). 



(1. Stativ. 



Bausch & Lomb condensor and substage (The Microscope vol. VII, 1887, p. 16). 

 Warm and cold „stages" (Journ. R. Microsc. Soc. 1887 pt. 2 p. 299). 



e. Mikrometer. 

 Ewell, M. D., Micrometric measurements (The Microscope vol. VII, 1887, p. 10). 



f. Testobjecte. 



Morris, AV., Notes on experiments in mounting the Amphipleura peUucida in 

 media having a higher refractive index than Canada baisam (Journ. and 

 Proceed. R. Soc. New South Wales vol. XIX, 1886, p. 121). 



g. Varia. 



Berling, O., Verzeichniss der wichtigsten Erscheinungen auf dem Gebiete der 

 Mikroskopie. Berlin (Sayffarth) 1886. 8 pp. 8". 



Guardia, J. , Hints for microscopists (Engl. Mechan. vol. XLV, 1887, p. 11). 



Kerber, A., Bestimmung der Brechungsexponenten, für welche die chroma- 

 tische Abweichung zu heben ist (Centralzeitg. f. Opt. u. Mechan. Bd. VIII, 

 1887, No. 9 p. 97). 



Kerber, A., Bestimmung der Farbe, für welche die sphärische Aberration zu 

 heben ist (Centralzeitg. f. Opt. u. Mechan. Bd. VIII, 1887, No. 5 p. 49). 



(Mayall, J.), A visit to Jena (Journ. R. Microsc. Soc. 1887 pt. 2 p. 322). 



Myall, J., Conferences sur Ic microscope. Suite. (Journ. de Microgr. t. XI> 

 1887, no. 3 p. 113). 



