An Introduction to BotanyLongman, Orme, Brown, Green, and Longmans, 1839 - 594 páginas |
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Página 8
... important changes took place in certain cells of the ordinary structure , which had not pre- viously undergone any alteration : in each of these there appeared three or four rings placed parallel with each other , adhering to the ...
... important changes took place in certain cells of the ordinary structure , which had not pre- viously undergone any alteration : in each of these there appeared three or four rings placed parallel with each other , adhering to the ...
Página 9
... important to distinguish them for practical purposes . I shall therefore pro- ceed henceforward to speak of them as if they were distinct in their origin . SECT . I. Of Cellular Tissue , or Parenchyma . CELLULAR , UTRICULAR , or ...
... important to distinguish them for practical purposes . I shall therefore pro- ceed henceforward to speak of them as if they were distinct in their origin . SECT . I. Of Cellular Tissue , or Parenchyma . CELLULAR , UTRICULAR , or ...
Página 18
... important varieties : - 1. Spiral fibres repressed by mucus , but having sufficient elasticity to uncoil when the mucus is dissolved , and then breaking up into rings . ( Plate I. fig . 16. ) These are what are found in the seed - coat ...
... important varieties : - 1. Spiral fibres repressed by mucus , but having sufficient elasticity to uncoil when the mucus is dissolved , and then breaking up into rings . ( Plate I. fig . 16. ) These are what are found in the seed - coat ...
Página 73
... importance in regard to the general structure of a plant . They consist of scales imbricated over 17 18 each other , the outermost being the hardest and thickest , and surrounding a minute cellular axis , or growing point , which is in ...
... importance in regard to the general structure of a plant . They consist of scales imbricated over 17 18 each other , the outermost being the hardest and thickest , and surrounding a minute cellular axis , or growing point , which is in ...
Página 80
... importance is , that these nodules have an abundance of cam- bium in the spring , and yet they are not , he says , in commu- nication with the alburnum of the tree ; whence he concludes that cambium is elaborated by the bark exclusively ...
... importance is , that these nodules have an abundance of cam- bium in the spring , and yet they are not , he says , in commu- nication with the alburnum of the tree ; whence he concludes that cambium is elaborated by the bark exclusively ...
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Palavras e frases frequentes
Adolphe Brongniart albumen anther apex appears axis bark base become body botanists Botany bracts branches buds bundles called calyx Cand Candolle carbonic acid carpels cause cavity cells cellular tissue centre chalaza character colour common considered consists containing corolla cotyledons cyclosis developement dicotyledons direction disk distinct Dutrochet elongated embryo epidermis exist external extremity fibres filament fleshy flowers fluid foramen fruit glands grains green growing hairs hilum inches integument kind latex layers leaf leaflets leaves light Linnæus lobes margin matter medullary rays membrane Mirbel monocotyledons nature nitrogen nucleus observed organs ovarium ovary ovule oxygen parenchyma pericarp petals petiole pistil pith placenta plants Plate plumula pollen pollen tube produced quantity radicle Raphides remarked roots round seeds separate side sometimes species specimens spiral vessels stamens stem stigma stomates structure substance surface term terminating tion tree tubes vascular vegetable veins wood woody tissue yellow
Passagens conhecidas
Página 593 - Dr. Ure's Dictionary of Arts, Manufactures, and Mines : Containing a clear Exposition of their Principles and Practice.