Vegetable Organography, Or, an Analytical Description of the Organs of Plants Volume 1

Vegetable Organography, Or, an Analytical Description of the Organs of Plants Volume 1

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1839 edition. Excerpt: ...zones of which each annual layer is formed. It results from this production of medullary rays from each of the annual zones, that their number is much larger in the layers of the circumference than in those of the centre. The medullary rays are not simple processes, but radiating and interrupted vertical lamina, directed towards the circumference; we can be assured of this by making a vertical or oblique section. We are thus enabled to follow them through more or less of their extent. They form the reddish spots which are seen upon planks of Beech or Oak cut obliquely. It is in this manner that is made what workmen call Dutch Oak, which was formerly thought to be a distinct species, but in reality it is only produced by art. All the medullary rays are composed of cellular tissue, elongated horizontally, and moderately compact. It is evident that they establish a direct communication from the centre to the circumference, or from the circumference to the centre; but in no case are coloured juices ever seen passing through them. The continuity of the medullary rays from their origin to the circumference is very well observed when we examine wood which is rather soft; such as, for example, the Mistletoe, or certain fleshy plants. One is sometimes tempted to believe that they are continued even into the bark; and this opinion has been maintained by several naturalists. Some have spoken of the medullary rays of the central system as being continuous with those of the cortical; others as being distinct. Mirbel and Dutrochet have given great weight to this last opinion; and if it be admitted that the two systems are essentially distinct at their origin, we are obliged to conclude that in the cases where the rays seem to pass into one another, it is more

Product details

  • Paperback | 94 pages
  • 189 x 246 x 5mm | 181g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236584643
  • 9781236584649