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optischen Dickenmessung (Zeitschr. f. Instrumentenk. Bd. XXIV, 1904, 



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Soc. 1903, pt. 5, p. 587). 

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its limb (Journ. R. Microsc. Soc. 1903, pt. 5, p. 590). 

 (Nelson, E. M. ,) Early glass micrometers (Journ. R. Microsc. Soc. 1903, 



pt. 5, p. (J72). 

 d'Ocagne, M., Les Instruments de presicion. Paris 1903, 39 pp. 

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p. 430). 

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microscope (Journ. R. Microsc. 1903, pt. 4, p. 447). 

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and of ultra-microscopic bacteria (Journ. R. Microsc. Soc. 1903, pt. 5, 



p. 573). 

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3. Mikrophotographie und Projection. 



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(Eoot, K. , a. Ströbele, E. C.,) New method of foeussing in photomicro- 

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