. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . Fig. 426. Tobacco. Upper epidermis. X160. (Moeller). Fig. 427. Tobacco. Lower Epidermis. X160. (Moeller.) with thin walls and a broad base, but are of four forms: (i) jointedwith pointed or blunt apex; (2) like the first, but branching. (3) glandu- 49© ALKALOIDAL PRODUCTS. lar with multicellular head and jointed stem; (4) like the last, but withshort unicellular stem. The first three forms reach an extraordinarylength, and are usually evident to the naked eye. The cuticl
. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . Fig. 426. Tobacco. Upper epidermis. X160. (Moeller). Fig. 427. Tobacco. Lower Epidermis. X160. (Moeller.) with thin walls and a broad base, but are of four forms: (i) jointedwith pointed or blunt apex; (2) like the first, but branching. (3) glandu- 49© ALKALOIDAL PRODUCTS. lar with multicellular head and jointed stem; (4) like the last, but withshort unicellular stem. The first three forms reach an extraordinarylength, and are usually evident to the naked eye. The cuticle is striatedand often granular on the surface. Mesophyl. The chlorophyl parenchyma is brown. Numerous cellsfilled witli cr}stal sand are present. DIAGNOSIS. The characteristic elements are the epidermis with the four formsof multicellular hairs, also the mcsocarp cells with crystal sand. Theepidermal cells with hairs are readily found in surface preparations offragments from cigars, smoking and chewing tobacco, also in powdermounts of snuff. The latter, being made from the coarser part of theleaf, contains a preponderance of vascular elements. Before searchingfor adult
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Keywords: ., bookcentury1900, bookdecade1910, bookpub, booksubjectplantanatomy
