This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...present. Place in warm alcohol until the chlorophyll is dissolved. Bring the leaves into an alcoholic solution of iodine for a half-hour. The leaves will be colored a dark blue if they contain starch. EXPERIMENT 48. MICROCHEMICAL TEST FOR STARCH. Decolorize some filaments of Spirogyra, or leaves of ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...present. Place in warm alcohol until the chlorophyll is dissolved. Bring the leaves into an alcoholic solution of iodine for a half-hour. The leaves will be colored a dark blue if they contain starch. EXPERIMENT 48. MICROCHEMICAL TEST FOR STARCH. Decolorize some filaments of Spirogyra, or leaves of Funaria as above, and place on a glass slide in a drop of chloral hydrate (chloral hydrate 5 parts, water 2 parts). Add a drop of a solution of iodine in iodide of potassium, and examine with the microscope. A thin section of large leaves may be examined in this manner. EXPERIMENT 49. STARCH AS AN INDICATION OF PHOTOSYNTHESIS. Place some Spirogyra or Vaucheria in a dark chamber for 24 hours. Test some of the filaments for starch. It will be found absent. Set the vessel containing the filaments in the sunlight for a few minutes. Examine a second lot. Starch will be found present. EXPERIMENT 50. FORMATION OF STARCH FROM SUGAR. Deprive a Geranium plant of starch by placing in a dark chamber for 24 hours or longer. Test for starch, and if none is present cut off a leaf and place it in a 20$ solution of sugar for a week in a dark chamber. Test for starch. The protoplasm of the leaf has used the sugar as food and has also converted a portion of it into starch. CHAPTER IV. RESPIRATION AND OTHER FORMS OF METABOLISM. 33. Nature of Metabolism.--By various processes, of which photosynthesis is an important example, a large number of complex substances are formed in the plant. The synthesis of complex compounds from those of simpler composition is termed constructive metabolism. In this process a portion of the oxygen in the simple compounds is liberated. Thus in photosynthesis water and carbon dioxide, both containing oxygen, are combined and a portion of...
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