. Come far crescere le colture. Un trattato sulla composizione chimica, la struttura e la vita dell'impianto, per tutti gli studenti di agricoltura ... Chimica agraria; crescita (piante). Il VBGBTATITE OEGANS OP piante. 289 Le particelle di aria atmosferica hanno un facile accesso alla parte interna di tutte le foglie, tuttavia densa e chiudere le loro epi il derma può essere tuttavia pochi o piccoli loro stomata. Tutte le foglie sono attivamente impegnati nell'assorbire ed espirando cer- tain ingredienti gassosi dell'atmosfera durante tutta la loro esistenza sana. La pianta intera è, infatti, permeabile all'aria attraverso il stomata lea

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. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). THE VBGBTATITE OEGANS OP PLANTS. 289 The particles of atmospheric air have easy access to the interior of all leaves, however dense and close their epi- dermis may be, however few or small their stomata. All leaves are actively engaged in absorbing and exhaling cer- tain gaseous ingredients of the atmosphere during the whole of their healthy existence. The entire plant is, in fact, pervious to air through the stomata of the leaves. These com- municate with the intercellular spaces of the leaf, which are, in general, occupied exclusively with air, and these again connect with the ducts which ramify throughout the veins of the leaf and branch from the vascular bundles of the stem. In the bark or epidermis of woody stems, as Hales long ago discovered, pores or cracks exist, through which the air has communi- cation with the longitudinal ducts. These facts admit of demonstration by simple means. Saclis employs for this pur- pose an apparatus consisting of a short wide tube of glass, 5, flg. 59, to which is adapted, below, by a tightly fitting cork, a bent glass tube. The stem of a leaf is passed through a cork which is then secured air-tight in the other opening of the wide tube, the leaf itself . being included in the latter, and the joints are made air-tight by smearing with tallow. The whole is then placed in a glass jar con- â " ig- ⢠taining enough water to cover the projecting leaf-stem, and mercury is quickly poured into the open end of the bent tube, so as nearly to fill the latter. The pressure of the column of this dense liquid immediately forces air into the stomata of the leaf, and a corresponding quantity is forced on through the intercellular spaces and through the vein-duets into the ducts of the leaf-stem, whence it issues in fine bubbles at S. It is even easy iu many cases to de

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1860
• booksubjectagricul
• bookyear1868