La storia naturale delle piante, le loro forme, la crescita, la riproduzione e la distribuzione; . ulvini sono connectedtogether dal continuo delicato protoplasmic thread penetrando la cella-mura, eil disturbo molecolare del protoplasma, prodotta dallo stimolo, sebbene atfirst comprende soltanto una singola cella, viene trasmesso come una corrente elettrica i fili intelegraph sulle masse del protoplasma, messi insieme in stretta connessione,e collegata con il delicato di plasma-thread; in tal modo lo stesso fenomeno è producedin tutti, vale a dire la contrazione di cellule e una forzatura della cella-sap nel interc

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The natural history of plants, their forms, growth, reproduction, and distribution; . ulvini are connectedtogether by continuous delicate protoplasmic threads penetrating the cell-walls, andthe molecular disturbance of the protoplasm, produced by the stimulus, although atfirst it comprehends only a single cell, is transmitted like an electric current intelegraph wires over the masses of protoplasm, strung together in close connection, and linked by the delicate plasma-threads; thus the same phenomenon is producedin all, viz. contraction of the cells and a forcing out of cell-sap into the intercellularspaces. The other sensitive plants behave like the above-described Oxalis sensitiva, except that there is a difierence in the direction in which the leaves fold together. MEASURES FOR PROTECTING GROWING PLANTS FROM LOSS OF HEAT. 537 jEschynomene Indica, an elegant herb-like plant with papilionaceous flowers andextremely delicate doubly-pinnate leaves, as well as the Indian Smithia sensitiva(which likewise belongs to the Papilionacese), fold their leaflets together above, and. j^.UV-rK.XA. Fig 134 —Mimoba pudita iii di mil night positions. depress the common leaf-stalk directly the first rain-drop has produced a shaking.The same applies to several mimosas {Mimosa pudica, sensitiva, casta, dorviiens, humilis, viva), of which the first, a species native in Brazil, is represented in fig, 134. In these mimosas there is really to be noted a threefold movement; first ofail the tiny leaflets fold together above, and at the same time direct themselves a 538 MEASURES FOR PROTECTING GROWING PLANTS FROM LOSS OF HEAT. little forward, so that each in front is partly covered over by the one immediatelybehind it; then the four ribs or axes, beset with the tiny leaflets, move towards oneanother like fingers which had been outspread and are now closed together; andthirdly, the common leaf-stalk, bearing in front the four axes, droops downwards.The leaflets of several species of wood sorre

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• bookcentury1900
• bookdecade1900
• booksubjectbotany
• bookyear1902