An Introduction to Botany |
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Page 33
... zone of wood never contracts or expands after it has been deposited : new matter may be added to any part , but the arrangement of the tissue , once fixed , re- mains unchangeable . The principal argument , however , in favour of ...
... zone of wood never contracts or expands after it has been deposited : new matter may be added to any part , but the arrangement of the tissue , once fixed , re- mains unchangeable . The principal argument , however , in favour of ...
Page 61
... zones of bark are formed without any appearance of a dislocation or disruption of the tissue of the outside ; and in the Daphne Lagetto , the fibres of the liber are so tenacious that , instead of being ruptured by the force of the ...
... zones of bark are formed without any appearance of a dislocation or disruption of the tissue of the outside ; and in the Daphne Lagetto , the fibres of the liber are so tenacious that , instead of being ruptured by the force of the ...
Page 62
... zones is so very soon disturbed , and the distinction between them becomes so im- perfect , that even when the outermost coating is still entire , it is scarcely practicable to count the zones ; and as soon as the outside begins to ...
... zones is so very soon disturbed , and the distinction between them becomes so im- perfect , that even when the outermost coating is still entire , it is scarcely practicable to count the zones ; and as soon as the outside begins to ...
Page 64
... zone , and the woody fibre alone forms a compact mass on the outside . The second year another zone is formed on the outside of the first , with which it agrees exactly in structure , except that there is no medul- lary sheath ; the ...
... zone , and the woody fibre alone forms a compact mass on the outside . The second year another zone is formed on the outside of the first , with which it agrees exactly in structure , except that there is no medul- lary sheath ; the ...
Page 65
... zone being deposited every year as long as the plant con- tinues to live . As each new zone is formed over that of the previous year , the latter undergoes no alteration of struc- ture when once formed : wood is not subject to ...
... zone being deposited every year as long as the plant con- tinues to live . As each new zone is formed over that of the previous year , the latter undergoes no alteration of struc- ture when once formed : wood is not subject to ...
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Common terms and phrases
acid Adolphe Brongniart albumen anther apex appearance appendages arrangement axis bark base become body botanists bractea branches Brown buds called calyx Cand Candolle carpella cavity cells cellular tissue cellules centre chalaza characters Class colour common Compositæ compound considered consists corolla cotyledons cuticle dehiscence developed dicotyledons direction disk dissepiments distinct distinguished ducts earth elongated embryo exist extremely filament fleshy flowers fluid fructification fruit genera genus granules hairs hilum indehiscent inflorescence integuments kind latter leaf leaflets leaves Linnæus lobes margin medullary rays membrane Mirb Mirbel modifications monocotyledons nature observed organs ovarium ovula ovulum oxygen parenchyma peculiar pericarpium petals petiole pistillum pith placenta plants Plate plumula pollen produced racters radicle receptacle remarkable roots seed sepals separate side sometimes species spiral vessels sporules stamens stem stigma stomata structure substance surface term terminating testa tree tube valves vascular vegetation veins wood woody fibre
Popular passages
Page 6 - Thysanotus fasciçularii, the flowers of which are of a deep brilliant violet, with a remarkably satiny lustre, that appearance will be found to arise from each particular cell containing a single drop of...
Page 217 - ... in its substance, and of evaporating pores on its surface, enables the crude fluid sent from the roots to be elaborated and digested until it becomes the peculiar secretion of the species; the contraction of a branch and its leaves forms a flower ; the disintegration of the internal tissue of a petal forms an anther; the folding inwards of a leaf is sufficient to constitute a...
Page 525 - ... verging to green. Again, the ranunculus, which is originally of an intense yellow, sports into scarlet, red, purple, and almost any colour but blue. White flowers, which have a tendency to produce red, will never sport to blue, although they will to yellow ; the rose, for example, and chrysanthemums. It is also probable that white flowers with a tendency to produce blue, will not vary to yellow.