Strong drink and tobacco smoke : the structure, growth, and uses of malt, hops, yeast, and tobacco / by Henry P. Prescott.

  • Prescott, Henry Paul, active 1868.
Date:
1869
Catalogue details

Licence: Public Domain Mark

Credit: Strong drink and tobacco smoke : the structure, growth, and uses of malt, hops, yeast, and tobacco / by Henry P. Prescott. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    Groups of any or of all these forms of vessels (Plate 1, figs. 7—11) are known as vascular tissue, as dis- tinguished from the cellular tissue above described. The continuous growth of a plant is generally ac- companied by the formation of wood ; that is to say, much of the cellular tissue is supplanted by tougher and more unbending material, more suitable for the support of the plant during growth. These woody parts are mostly composed of long fibrous cells with thick walls. Fig. 12 represents one of them pointed at both ends, and fig. 13 another with nearly square ends. They occur in abundance in herbaceous plants, and in all wood knit together into a tissue, such as is seen at fig. 14. When united in one tissue with the vessels before described, the compound tissue is called fibro-vascular. A common deal shaving exhibits, under the micro- scope, a tissue composed of long cells pointed at both ends, and having on their sides pits, or cup-shaped depressions (fig. 15), which in two individual cells are fitted face to face, and thus form a cavity for the reception of the resinous matter which we smell so perceptibly in freshly-cut deal, or in newly-planed deal shavings and sawdust. A curious form of the fibrous cell is, according to some authors, found in bark (figs. 16, 17), some being branched. Fig. 18 is another form of fibrous cell, also found in bark, and like some cells dotted. In inner coats of seeds are commonly found minute, elongated