REFERENCES TO LITER ATVRE OF MICROSCOPE 293 

 . 18S4. On the mode of vision with objoctivcs of wide 



aperture, Jovr. Roy. Micr. Soc, 2()-26. 



16. . 1884. Note on tlio proper definition of the amplifying 



power of a lens or a lens system, Jour. Roy. Micr. Soc, 348-351. 



17. . 1886. tJber neue Mikroskope, Ges. Abh., 1:450-472. 



(An account of the production of the apochromatic objectives.) 



18. . 1889. On the effect of illumination by means of wide- 

 angled cones of light, Jour. Roy. Micr. Soc, 721-724. (Abbe's 

 practical contention here has apparently not been verified by time.) 



19. . 1890. tJber die Verwendung des Fhiorits fiir optische 



Zwecke, Ges. Abh., 1 : 478-486. (Sources of optical fluorite.) 



20. AiNSLiE, M. A. 1913. Dark-ground illumination in micro- 

 scopical work, Jour. Roy. Army Med. Corps, 379. 



21. . 1915. Tube-length adjustment, Engl. Mech., June 18, 



July 2 and 9. (According to Coles, the fullest account.) 



22. Akehurst, S. C. 1923. Note on divided mirror for Greenough 

 binocular. Jour. Roy. Micr. Soc, 378-380. Also Jour. Roy. Micr. 

 Soc, 159-160, 1928. 



23. AiMBRONN, H., and H. Biedentopf. 1913. Zur Theorie der 



mikroskopischen Bildererzeugung nach Abbe, 25 pp., Leipzig. 

 (Practical exercises.) 



24. and A. Kohler. 1914. Methoden zur Priifung der Objek- 



tivsysteme, 21 pp., Leipzig. (Practical exercises.) 



25. Barnard, J. E. and F. E. Welch. 1925. Practical Photomicro- 

 graphy, London. 



26. Bausch, E. Manipulation of the microscope, Bausch and Lomb, 

 Rochester, N. Y. 



27. and Loivrs. Catalogues. 



28. Becher, a. 1925. Zeit. loiss. Mikrosk. (On the use of anisol.) 

 28a. Becher, S. 1914. tJber eine auf die Struktur des Echinoderm- 



skelettes gegriindete neue Methode zur Herstellung von polar- 

 isiertem Licht, Zool. Anz., 44: 122. 



29. Beck, C. 1921. Notes on Resolution, Jour. Roy. Micr. Soc. 



30. . 1921. The Microscope, Vol. I, London. (Elementary.) 



31. . 1922. The Photometry of a bull's-eye lens for illuminat- 

 ing microscopic objects. Jour. Roy. Micr. Soc, 389-398. 



32. . 1922. Glare and flooding with transmitted light, Jottr. 



Roy. Micr. Soc, 399-405. (Important experiments described.) 



33. . 1923. The Microscope, Vol. II, London. (Fundamental 



experiments on glare.) 



34. Belling, J. 1923. Microscopical methods, Amer. Naturalist, 



57 : 92-96. (Methods for use with iron-acetocarmine preparations.) 



35. . 1925. Compensating the unoccupied eye in monocular 



instruments, Science, 62 : 54-55. 



