VII, 3. Neue Literatur. 423 



b. Ocular. 

 (Tolles, R. B.), Binocular eye-pieces (Journ. R. Microsc. Soc. 1890 pt. 3 p. 383). 



c. Mikrometer. 



Ewell, D., Amplification in micrometry (Journ. New York Microsc, Soc. vol. VI, 



1890, no. 1 p. 4). 

 (Koch, A.), Winkel's combination of screw-micrometer and glagS - micrometer 



eye-piece (Journ. R. Microsc. Soc. 1890 pt. 3 p. 391; cfr. diese Zeitschr, 



Bd. VI, 1889, p. 33). 

 Screw eye - piece micrometers (Journ. R. Microsc. Soc. 1890 pt. 3 p. 388). 



(1. Testobjecte. 



Moeller, J, D., Beschreibung einer hervorragend schönen und vollständigen 

 Sammlung von Diatomaceen-Typen-Platten angefertigt in den Jahren 1886 

 bis 1890. 4 pp. 8'\ 



e. Verschiedenes. 



(Abbe, E.)? On the use of fluorite Ibr optical purposes (Journ. R. Microsc. 



Soc. 1890 pt. 3 p. 392 ; cfr. Zeitschr. f. Instrumentenk. Bd. X, 1890, H. 1 p. 1). 

 Aiulries, P., Eine neue Methode des italienischen Physikers Govi, um den 



Ort, die Lage und Grösse der Bilder von Linsen oder Linsensystemen zu 



construiren und zu berechnen (Centralzeitg. f. Opt. u. Mechan. Bd. XI, 



1890, No. 9 p. 97). 

 (Caplatzi, A.)? Jena glass (Journ. R. Microsc. Soc. 1890 pt. 3 p. 398; cfr. 



Engl. Mechan. vol. LI, 1890, p. 222). 

 Blackiiali/s simple microscope with multiple Illuminator (Journ. R. Microsc. 



Soc. 1890 pt. 3 p. 380). 



3. Mikrophotographie. 



Frazer, On photography as an aid in anatomical, histological , and embryol- 

 ogical work (Report 59. meet. British Assoc. for the Advancement of Sei. 

 1890 p. 639). 



Sternberg, G. M., Photomicrography by gas Hght (Circulars John Hopkins 

 Univ. Baltimore vol. IX, no. 80, 81 p. 72). 



