. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . d walls. In Mexican,Panama, Honduras, and some other Central American varieties, thepores are greatly elongated, usually spirally, less often longitudinallyor transversely, giving the tissue a higlily characteristic i)eculiar structure is not found in Bourbon, South .\merican, or llieother common varieties, the pores being cither round or oval. y/ihlILL/4. 575 3. Mesocarp (Figs. 491 and 493, p). This is a loose parenchymaof large, thin-walled cells often
. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . d walls. In Mexican,Panama, Honduras, and some other Central American varieties, thepores are greatly elongated, usually spirally, less often longitudinallyor transversely, giving the tissue a higlily characteristic i)eculiar structure is not found in Bourbon, South .\merican, or llieother common varieties, the pores being cither round or oval. y/ihlILL/4. 575 3. Mesocarp (Figs. 491 and 493, p). This is a loose parenchymaof large, thin-walled cells often 150 /x in diameter, with dark-coloredcontents. Here and there narrow but elongated cells, commonly arrangedend to end in longitudinal rows, contain large bundles of extraordinarilylong raphides of calcium oxalate reaching 500 jx in length, which, inthe preparation of the specimen, are often broken into short are best seen after treating tangential sections with alkali. Todemonstrate the presence of vanillin, mount a cross-section in 5 per centphloroglucin solution and draw a drop of sulphuric acid under the. Fig. 491. Vanilla, Cross section of pericarp, ep epicarp; p mesocarp with K crystals;pi inner layers of mesocarp; 5 papillae of endocarp. Xi6o. (Moeller.) cover-glass. A magnificent carmine color appears immediately. Thenumerous bundles running through the mesocarp are of the collateralor endogenous type, consisting of spiral and reticulated vessels, jointedporous elements, sieve tubes, and bast fibers. Tschirch and Oesterle havenoted that the pores of the latter are oval and are not accompanied bythe diagonal fissures characteristic of most bast fibers. The cells ofthe inner mesocarp are smaller than in the outer and middle layers. 4. The Inner Epidermis between the three pairs of placentae bearsnumerous thin-walled, glandular papillae {s) about 300 [x long, filled with 576 SPICES AND CONDIMENTS. balsam. Tschirch and Ocsterlc find that the secretion is formed b
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Keywords: ., bookcentury1900, bookdecade1910, bookpub, booksubjectplantanatomy
