. Practical text-book of plant physiology. Plant physiology. 122 RELATIONS OF PLANTS TO LIGHT the capacity of chlorophyl for absorbing rays of one wave-length and emitting others of greater length, or of converting rays from the upper part of the spectrum to the lower red. 189. Absorption Spectrum of Chlorophyl. Adjust an Abbe, or any convenient spectroscopic eyepiece to a microscope fitted with a low power objective. The instrument should stand on a table in a strong diffuse light and the mirror of the micro-. Fig. 59. Abbe micro-spectroscope, a, b, screws for regulating the slit through whic
. Practical text-book of plant physiology. Plant physiology. 122 RELATIONS OF PLANTS TO LIGHT the capacity of chlorophyl for absorbing rays of one wave-length and emitting others of greater length, or of converting rays from the upper part of the spectrum to the lower red. 189. Absorption Spectrum of Chlorophyl. Adjust an Abbe, or any convenient spectroscopic eyepiece to a microscope fitted with a low power objective. The instrument should stand on a table in a strong diffuse light and the mirror of the micro-. Fig. 59. Abbe micro-spectroscope, a, b, screws for regulating the slit through which light passes, c, screw for clamping apparatus to tube of microscope, d', spring which, loosened, allows the ocular portion to swing around on the pivot, d. E, phial containing solution to be tested. S, mirror for reflecting light upon solution. S', mirror for illuminating scale, p, screw for manipulating Amici prism, and the ex- tended drum into which the screws a, and 6, project contains the comparison prism which receives light from the objective of the microscope, and throws a solar spec- trum alongside that which has come from the light passing through the solution aXE. scope should be arranged to give a plain solar spectrum. Light from the sun should be thrown on the lateral mirror of the spectroscope by means of a heliostat, or a strong artificial light from a welsbach or argand burner should be provided. The spectrum of the second should be of the same intensity. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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