. Plant life, considered with special references to form and function. Plant physiology. A^VrjUITIOA''. 169 236. Storage.—In the higlu-r plants storage places are secured by the enlargement of roots, sterns or lca\'es, to form. O /5 0 Fig. 174.—Reserve starcli. .-I, two cells of a potato, showing enclosed starch grains The other contents not shown. /^, compound starch grains from a grain of oats Three of the component granules of a large grain are shown separately. C, starch grains from a beau. All highly magnified.—After Kerner. reservoirs. Similar specialization of parts of lower ])lants occ
. Plant life, considered with special references to form and function. Plant physiology. A^VrjUITIOA''. 169 236. Storage.—In the higlu-r plants storage places are secured by the enlargement of roots, sterns or lca\'es, to form. O /5 0 Fig. 174.—Reserve starcli. .-I, two cells of a potato, showing enclosed starch grains The other contents not shown. /^, compound starch grains from a grain of oats Three of the component granules of a large grain are shown separately. C, starch grains from a beau. All highly magnified.—After Kerner. reservoirs. Similar specialization of parts of lower ])lants occurs. Carbohydrates are somclinics transformed into fats for storage purposes, Imt carbo- hydrate and jjroteid reserve food is usually solid. Reserve car- bohydrates usually occur in the form of starch, sugar, cellulose, gum, etc. Reser\e proteids are usually in the form of aleurone grains. The starch is deposited in y - f, the form of large rounded or oval grains (sphere-crystals), which often y ', c 00 0 Fic;. 175.—Aleurone (proteid) grains, show layers Ot differcTlt COnipOSltlOll /, from seed of peony. a\ frorr tlie outer, />, from the middle, c, and density (fi^^- I74)- Fats occur from the inner layers. //, from in liquid form as droplets of vari- ous size, and are only rarely solid. Aleurone grains are really vacuoles filled with reserve proteids. Some of the proteids often seed of castor bean, a, in alcoho /', after treatment with iodine solu- tion and alcohol. Tn both. ,<', glo- boid ; ^-, crystalloid. Very highly magnified.—After 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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