. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . alls and the bright yellow colordue to the thick cuticle. The more or less transversely or diagonallyelongated cells resemble those of wheat and other cereals, but form onlyone layer. Perisperm (Figs. 73 and 75, N). As has been noted in the precedingparagraph, remains of the nucellus may be seen in section after treatmentwith potash and staining with chlorzinc iodine. In carefully preparedmounts the reticulated radial walls are evident. These cells are easilyseen in surf
. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . alls and the bright yellow colordue to the thick cuticle. The more or less transversely or diagonallyelongated cells resemble those of wheat and other cereals, but form onlyone layer. Perisperm (Figs. 73 and 75, N). As has been noted in the precedingparagraph, remains of the nucellus may be seen in section after treatmentwith potash and staining with chlorzinc iodine. In carefully preparedmounts the reticulated radial walls are evident. These cells are easilyseen in surface view in mounts prepared as above described, and aredistinguished from the cells of the spermoderm by the beaded appearanceof the radial walls, due to reticulations, and their dark blue color. Thecells are transversely elongated and are side by side in rows. Endosperm (Fig. 73, E). i. The Aleurone Cells (al) are roundedpolygonal, 25-40 /^ in diameter, with uncommonly thin walls. 2. Starch Parenchyma. The thin-walled cells contain starch grains(Fig. 76) 2-10 II in diameter often united into oval aggregates containing. Fig. 76. Rice Starch. X 300. (Moeller.) from two to upward of a hundred grains. Grains from the center of alarge aggregate have only flat facets, but those from the outer portion arecurved on the exposed surfaces. Perfectly round graiTis arc rare. In com-mercial rice-starch one seldom finds aggregates, since they are usuallybroken up in the process of manufacture. The grains show distinctcrosses with crossed Nicols, the hilum being centrally located. no GR/1IN. DIAGNOSIS. Whole Rice. Rice is largely used as a human food in the form of thewhole grain divested of the chatT, pericarp, spermoderm, the larger partof the germ, and some of the aleurone layer. Puffed Rice is made by the same process as puffed wheat (p. 70). Mill Products. Rice Flour and various other mill products are usedin preparing infant and invalid foods, griddle cakes, puddings, etc. In all the pr
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Keywords: ., bookcentury1900, bookdecade1910, bookpub, booksubjectplantanatomy
