266 Neue Literatur. VIII, 2. 



Swift and Sdn's improved student's microscope (Journ. R. Microsc. Soc. 1891 

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b. Objectiv. 



(Blackliam, G. E.)? On the amplifyiiig power of objectives and oculars in 



the Compound microscope (Journ. K Microsc. Soc. 1891 pt. 1 p. 114; cfr. 



Proceed. Amer. Soc. Microscopists vol. XI, 1889, p. 22). 

 (Cox, J. D.)j The new apocliromatic objective (Journ. R. Microsc. Soc. 1891 



pt.2 p.248; cfr. The Microscope vol. X, 1890, p. 164). 

 (Malassez , L.), On a new System of erecting and long focus objectives 



(Journ. R. Microsc. Soc. 1891 pt.2 p. 246; cfr. Arch. de Med. Exper. t. I, 



1889, p. 449). 

 N. W. , Neuer Objectivwechsler für das Mikroskop (Centralzeitg. f. Opt. u. 



Mechan. Bd. XII, 1891, No. 4 p. 46). 



c. Ocular. 



(Ligthon, W.), A new ocular diai)hragm (Journ. R. Microsc. Soc. 1891 pt.2 

 p. 255 ; cfr. The Microscope vol. X, 1890, p. 8). 



d. Tisch. 



(Hyatt), Substage condenser (Journ. R. Microsc. Soc. 1891 pt. 2 p. 256; cfr. 



Journ. New York Microsc. Soc. vol. VII, 1891, p. 54). 

 (Nelson, E. M.)j The substage condenser: its history, construction, and mana- 



gement; and its effect theoretically considered (Journ. R. Microsc. Soc. 



1891 pt. 1 p. 90; cfr. Journ. Quekett Microsc. Club. vol. IV, 1890, p. 116). 

 New cheap ccntering substage (Journ. R. Microsc. Soc. 1891 pt. 2 p. 257). 



e. Beleuclitungsapparate. 



(Scliioffcrdecker, P.), Die Kochs -Woi.z'sche Mikroskopirlarape (Centralzeitg. 

 f. Opt. u. Mechan. Bd. XII, 1891, No. 7 p. 73: cfr. diese Zeitschr. Bd. VII, 

 1890, p. 450). 



f. Mikrometer. 



Knorro, V., Untersuchungen über Schraubcnniikromcter (Zeitschr. f. Instru- 



mcntcnk. Bd. XI, 1891, H. 2 p. 41; 11.3 p. 83). 

 (Lindau, G.), New measuring apparatus for niicroscopical purposes (Jonrn. R. 



Microsc. Soc. 1891 pt.2 p. 252; cfr. Naturwiss. Wochenschr. Bd. IV, 1889, 



p. 185; diese Zeitschr. Bd. VI, 1889, ]>. 482). 



