. La teoria e la pratica dell'orticoltura; O, un tentativo di spiegare le operazioni principali di giardinaggio su impianto fisiologico di Grounds. Alla parte che era stato ferito. Guarito, la parte accanto alla base della foglia rimanendo dello stesso spessore prima della lesione, mentre il bordo della parte esterna graduallyaddensed, e sviluppato un piccolo germoglio vicino alla midrib, da cui un certo numero di radici fibrose minute ha emesso ed infine un gambo andleaves, come rappresentato nel disegno allegato. Por parecchi monthstla pianta perfetta continuò ad esistere in questo stato, senza nessun altro thaai di nutrimento

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. The theory and practice of horticulture; or, An attempt to explain the chief operations of gardening upon physiological grounds. plant at the part that had been injured. healed, the part next the base of the leaf remaining of the same thicknessas before the injury, while the edge of the outer portion graduallythickened, and developed a small bud close to the midrib, from whicha number of minute fibrous roots issued, and eventually a stem andleaves, as represented in the accompanying sketch. Por several monthsthe perfect plant continued to exist in this state, with no other nourish-ment thaai what the portion of the leaf on which it grew, and the airof a warm, damp, hothouse afforded it. As the plant increased in size, the old leaf gradually became exhausted, and perished altogether assoon as the young leaves gained the ascendancy and deprived it of the 24 f OKMATION OF ROOTS BY LEAVES. .scanty means that had preYionsly supported it. Similar instanoes arefanuliaito careful observers, not the least interesting of which is thatof a broken Celery leaf which had sent out roots from the lowermost ofits wounded edges.. Fig, V.—Leaf of Celery producing roots from thie lower edge of a woimd. The immediate cause of the formation of roots is involved inobscurity, and is one of the most important parts of vegetablephysiology still to be investigated with reference to horticulture.We all know how difficult it is to cause the cuttings of somekinds of plants to produce young roots, and how rapidly theyare emitted by others ; it is to be supposed, that the difficultywould be diminished in aU such cases, if we knew exactly underwhat circumstances roots are formed. Nothing, however, sufficiently certain and general to merit quotation has yet beenascertained concerning this important property, which appearsto be connected with specific vitality, except the followingfacts, viz. that roots are most readily, if not exclusively, formed CAUSE OF THE FORMATION OF BOOTS. 25 in darkness and

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1850
• booksubjec
• booksubjectgardening