The natural history of plants, their forms, growth, reproduction, and distribution; . posite side ( outside). At MECHANISMS FOR CONVEYANCE TO AND FRO. 477 the end of the second year the stem is no longer circular, as at the first; ithas added two rings, as it were, and now appears elliptical in cross section;and since new portions are added in this way repeatedly from year to year,and new rings are always becoming annexed to those already existing, thestem gradually becomes ribbon-like, and exhibits a cross section like that shownin fig. 1281 The soft bast has thus received the most protec
The natural history of plants, their forms, growth, reproduction, and distribution; . posite side ( outside). At MECHANISMS FOR CONVEYANCE TO AND FRO. 477 the end of the second year the stem is no longer circular, as at the first; ithas added two rings, as it were, and now appears elliptical in cross section;and since new portions are added in this way repeatedly from year to year,and new rings are always becoming annexed to those already existing, thestem gradually becomes ribbon-like, and exhibits a cross section like that shownin fig. 1281 The soft bast has thus received the most protected positionimaginable, and lateral pressure is unable to interfere with its functions. Whenthe supporting stem round which the Ehynchosia has twined grows enormouslyin thickness, the liane becomes stretched, and experiences a lateral strain, butthe sap can, nevertheless, continue its journeys unhindered in the soft bast. In the liane Thunhergia laurifolia, a cross section of whose stem is representedin fig. 128^, the protection is obtained in quite a different way. Here the green.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
