XXX, 4. Neue Literatur. 549 



(1. Objektive. 



New achromatic objectives (Journ. R. Microsc. Soc. 1913, pt. 4, p. 420; vgl. 

 Zeiss" Katalog 1913). 



e. Heizvorrichtung. 



fCottrell, F. G.,) Electrically heated object-carrier for microscopes (Journ. 

 R. Microsc. Soc. 1913, pt. 5; p. 536: vgl. Journ. Americ. Chem. Soc. 

 vol. XXXIV, 1912, p. 1328; Deutsche Median. -Zeitg. 1913, p. 115—116). 



f. Beleuchtungsapparate. 



Beck's dark-ground illuminator (Journ. R. Microsc. Soc. 1913, pt. 4, p. 422; 



vgl. R. a. J. Beck's special Catalogue 1913). 

 New low-power condensor (.Journ. R. Microsc. Soc. 1913, pt. 4, p. 528; vgl. 



Journ. Quekett mircosc. Club vol. XII, 1913, p. 95 — 96). 



g. Verschiedenes. 



(Ainslie, M. A.,) Measurement of magnifying power (Journ. 11. Microsc. Soc. 



1913, pt. 5, p. 529 ; vgl. Engl. Mechanic vol. XCVIII, 1913, p. 12—1.3). 

 Esclangon, E. , Method of obtaining microscopical bench-marks exactly 



circular in micrometric observations ; application to the study of trun- 



nions in äquatorial telescopes (Journ. R. Microsc. Soc. 1913, pt. 5, p. 528; 



vgl. Proces-verbaux des seances Soc. Sc. phys. et nat. de Bordeaux 



1910—11, p. 9—13). 

 Juel, O., LiXNEs microscop (Svensk. botan. Tidskr. vol. Vll, 1913, fasc. 2, 



p. 196 med 3 Textfig). 



