. The microscope : an introduction to microscopic methods and to histology. Microscopes. 244 PHO T( ^MICROGRAPH)' [CH. VIII berg, Francotte, Spitla and the special catalogs on photo-micrography and projection issued.'by the great opticians. The Journal of the Royal Micro- scopical Society and of the Quekett Micr. Club; Zeit. wiss. Mikroskopie; the Trans. Amer. Micr. Soc,; the Amer. Monthly Micr. Journal; the Journal of Applied Microscopy. For the photography of metallic surfaces, see the various journals of engineering and; metallurgy, but especially Sauveur's journal, the Metallo- graphist, b
. The microscope : an introduction to microscopic methods and to histology. Microscopes. 244 PHO T( ^MICROGRAPH)' [CH. VIII berg, Francotte, Spitla and the special catalogs on photo-micrography and projection issued.'by the great opticians. The Journal of the Royal Micro- scopical Society and of the Quekett Micr. Club; Zeit. wiss. Mikroskopie; the Trans. Amer. Micr. Soc,; the Amer. Monthly Micr. Journal; the Journal of Applied Microscopy. For the photography of metallic surfaces, see the various journals of engineering and; metallurgy, but especially Sauveur's journal, the Metallo- graphist, begun in 1898; Jour. Roy. Micr. Soc. See the works on; photo-micrography and photography for the details of lantern slide making. See for the Petri dishes and test-tubes, Atkinson, Botanical Gazette, xviii (1893), p. 333; Spitta, Photo-Micrography (1899), P-26. For photography with ultra-violet light see Zeiss special catalogs. Jour- nal of the Royal Microscopical Society, Zeitschrift fur wiss. Mikroskopie; Dr. August Kohler, Zeit. wiss. Mikr. Bd. xxi, 1904, pp., 129-165, 273-304; six plates; Band 24, 1907, pp. 360-366. Dr. H. C. Ernst of the Harvard Medical .School; Jour. Med. Research N. S. Vol. 9, 1905-6 pp. 463-468, Various Spectra.—These spectra illustrate some of the points in the dis- cussion of color screens (§ 291). The Solar spectrum shows that all the wave lengths of light are present except for the very narrow dark lines (Fraunhofer lines, \ 214). The Sodium spectrum is an example of the spectrum of an incandescent gas ; it is also an extreme example of monochromatic light. Sodium light is very brilliant, but the appearance of surrounding objects gives one a good idea of the changed appearance which the universe would assume if illuminated by monochromatic light. The spectra of permanganate and methemoglobin illustrate well the ab- sorption spectra of colored substances. If one were to use permanganate for a color screen the object photograph- in
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