. A laboratory course in plant physiology. Plant physiology; Plant ecology. PHOTOSYNTHESIS 83 the whole clamped in a frame which carries in front of the slit two spring clips arranged to hold a small flask, or vial, of chlorophyl solution, which of course can be made of greater or lesser density. It may be set in front of a light, when the lands may be studied and mapped at leisure, or, the base being unscrewed from the handle, it may be passed around the class for demonstration, each student directing it towards some selected source of light. A microspectroscope, for use with the microscope,
. A laboratory course in plant physiology. Plant physiology; Plant ecology. PHOTOSYNTHESIS 83 the whole clamped in a frame which carries in front of the slit two spring clips arranged to hold a small flask, or vial, of chlorophyl solution, which of course can be made of greater or lesser density. It may be set in front of a light, when the lands may be studied and mapped at leisure, or, the base being unscrewed from the handle, it may be passed around the class for demonstration, each student directing it towards some selected source of light. A microspectroscope, for use with the microscope, as described by Detmer, 23, may also be used, but is very expensive, and for our present pur- pose has no advantage over the above instruments/ "t Different thicknesses of solution may most effectively be secured by use of triangular troughs sold. Fig. 15.—An efficient arrangement or the spectroscope for the study of chlorophyl; upper section as seen from above, lower from the side, Xi. The dotted lines show the path of light, reflected in part by mirrors, from a single incan- descent lamp. The chlorophyl is in the flat (Soyka) flask. by dealers in chemicals, though the cement of some of these is attacked by alcohol. Very good and well-colored pictures of chlorophyl spectra are in the Frank and Tschirch diagrams (page 23), Plates XV, XVI. Demonstration. The chlorophyl spectrum may be shown to a class, though not to all simultaneously, by the hand instrument above described and figured (Fig. 16). It should be possible to project the spectrum finely upon a screen with a projecting 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 Ganong, William Francis, 1864-1941. New York, H. Holt and Co.
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