. Elementary botany. Botany. 66 PHYSIOLOGY. The leaves arc made transparent by the chloral hydrate so that the starch reaction from the iodine is easil}' detected. The followini:; is a convenient and safe metliod of extract- ing chlorophyll from leaves. Fill a large jian, preferably a dishpan, half full of hot water. This ma\' be kept hot b)' a small flame. ( )n the water iloat an e\'a])orating dish parti}' •filled with alcohol. The leaves should be first immersed in the hot water for several minutes, then jjlaced in the alcohol, which will ciuickly remove the chlorophyll. Now immerse the leav
. Elementary botany. Botany. 66 PHYSIOLOGY. The leaves arc made transparent by the chloral hydrate so that the starch reaction from the iodine is easil}' detected. The followini:; is a convenient and safe metliod of extract- ing chlorophyll from leaves. Fill a large jian, preferably a dishpan, half full of hot water. This ma\' be kept hot b)' a small flame. ( )n the water iloat an e\'a])orating dish parti}' •filled with alcohol. The leaves should be first immersed in the hot water for several minutes, then jjlaced in the alcohol, which will ciuickly remove the chlorophyll. Now immerse the leaves in the iodine solution. 138. Green parts of plants form starch when exposed to light.—Thus we find that in the case of all the green pilants we have examined, starch is present in the green cells of those which. FiK. 68. Fifr. 6q. Leaf of cnk-us slmwinj^ ^reeii and white .Similar leaf with iudine, the stareh areas, Ijefiire treatment with iodine. reaetiMii iniU- shMwinj.;: w-here the leaf was ^Teeii. have been standing for some time in (he sunlight where the proc- ess of the absf)rj)tion of CU. and the gi\"ing off of oxvgen can go on, and that in the case of plants grown in the dark, or in. 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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