242 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



so that when seen through the eyepiece an object is viewed as seen with 

 the eye — not inverted and reversed, as with an ordinary Microscope. 

 The body is mounted on a jointed arm to permit examination over 

 large surfaces, and has a post to fit any of the firm's dissecting stands. 



Fig. 45. 



Koristka's Loup of Two Achromatic Lenses.* — In this instrument 

 (fig. 46) the lenses are mounted in nickelled brass, and give a large 

 flat field. The complete combination gives a magnification of ten 



Fig. 46. 



diameters, a field of 20 mm., and a frontal distance of 17. mm. By 

 unscrewing the lower lens and operating only with the upper, a magni- 

 fication of five diameters is attained, the field being 26 mm. and the 

 frontal distance 27 mm. 



Mabx, H. — Ein handlicb.es Obduktionsnukroskop. 



Zeitschr. f. Mcdizinalb. Jahrg., xx. pp. 744-5. 



Petei, R. T. — A. van Leeuwenhoek's Mikroskop. 



Natur. Wochenschr., xxii. (1908) pp. 1-7. 



Schektel, S. — Der Bau des Mikroskops. Mihrokosmos, i. (1907) hefte 1-2. 



,, „ Uber friihere mikroskopische Forschungen und Bilder. 



Tom. cit., hefte 3-4. 

 Seibeet, W. & H. — Neues Stativ 5C. 



Zeitschr. f. angeiv. Mikrosk., xiv. (1908) p. 85. 



* F. Koristka, Milan, Catalogue xiii. (1908) Micrscopi ed Accessori, p. 77. 



