. Practical text-book of plant physiology. Plant physiology. ETIOLATED SEEDLINGS "5 all instances. The etiolated specimens must not be exposed to intense light even for a few minutes and the examination of them should be made by the use of an ordinary candle. The temperature should be kept at 15-20° C, and not so much water will be needed as in plants grown in daylight, owing to the les- —D. —B. :-a. Fig. 52. Cross section of portion of normal stem of young Quercus. A, proto- xylem. B, median part of wood-ring in which the medullary rays may be seen. C, cambium. D, bast. E, inner pe
. Practical text-book of plant physiology. Plant physiology. ETIOLATED SEEDLINGS "5 all instances. The etiolated specimens must not be exposed to intense light even for a few minutes and the examination of them should be made by the use of an ordinary candle. The temperature should be kept at 15-20° C, and not so much water will be needed as in plants grown in daylight, owing to the les- —D. —B. :-a. Fig. 52. Cross section of portion of normal stem of young Quercus. A, proto- xylem. B, median part of wood-ring in which the medullary rays may be seen. C, cambium. D, bast. E, inner periderm. sened transpiration. Control specimens should be grown under similar conditions but in full exposure to direct sunlight. Compare the etiolated and normal stems with regard to the length and thickness of the stems, length and number of inter- nodes, number and size of the leaves, and structure of all the. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1901
