Un corso pratico in botanica : con particolare riferimento ai suoi cuscinetti su agricoltura, economia, e sanificazione . escrezione, come l'acqua superflua presa con i minerali disciolti è esalata dalle foglie; o se incapace di passare per osmosi, harmlessand reso trattenuto nella forma dei curiouscrystalloidi fondali in varie parti di piante. Ma il tipo di selectionesercitato dalle cellule di vegeta-ble implica nopower di scelta, come amatter di fatto thosesubstances mostused dalla pianta che inportante sui suoi lifeprocesses sono ab-sorbed in quantitieshan muchGreater altri, beingtraveled a.

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A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . excretion, as the superfluous watertaken in with dissolved minerals is exhaled from the leaves;or if incapable of passing out by osmosis, rendered harmlessand retained in theform of the curiouscrystalloids foundin various parts ofplants. But whilethe kind of selectionexercised by vegeta-ble cells implies nopower of choice, as amatter of fact thosesubstances mostused by the plant incarrying on its lifeprocesses are ab-sorbed in muchgreater quantitiesthan others, beingtransferred to partswhere growth orother changes in theplant tissues are go-ing on, and thereused up in the work of nutrition, or excreted in part as wasteproducts. In either case their passage from cell to cell willgive rise to a continuous osmotic current in that direction, and the absorption of new matter will go on in proportion tothe amounts used up. 6i. Definition. — Tissue is a word used to denote anyanimal or vegetable substance having a uniform structureorganized to perform a particular office or function. Thus, . Fig. 73. — Roots of elm and sycamore contending forisession of the soil on a rocky bluff on the Potomac. 58 PRACTICAL COURSE IN BOTANY for instance, we have bony tissue and muscular tissue inanimals; that is, tissue made of bone substance and musclesubstance and doing the work of bone and muscle respec-tively. Likewise in plants, we have strengthening tissuemade up of hard, thick-walled cells, serving mainly for pur-poses of mechanical support, and vascular tissue, made up ofconducting vessels for conveying sap — and so on, for everyseparate function. Practical Questions 1. Wh} do raspberries and strawberries have a flabby, wilted look ifsugar has been put on them too long before they are served ? (7, 56.) 2. Where has the juice gone ? What caused it to go out of the berries ?(56, 59.) 3. Is a knowledge of the principles governing osmosis of any practicaluse to the hou

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• bookcentury1900
• bookdecade1910
• bookpublisher
• booksubjectplants