Annals of Botany Volume 3

Annals of Botany Volume 3

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 edition. Excerpt: ...winter, is very rarely seen, one instance is noticed in Fig. 3, b. I have repeatedly tested sections from the different parts of leaves of all the ages and in all the conditions mentioned above, to see if the pits in the walls were ever perforated, using for the purpose (after Gardiner) concentrated sulphuric acid in which methyl-violet was dissolved; or chlorzinciodine followed by staining with picro-Hoffmann's blue. The only cases in which perforation was observed occurred in the succulent leaf-scales of a spring-onion in which tangential sections from the lower half of the leaves showed the contents to be continuous through the swollen pits of the transverse septa, which were apparently free or almost free from callus. Where this continuity was noticeable it was so obvious (Fig. 5) that its apparent absence in the great majority of cases is probably due, not to difficulty of observation, but to the actual fact of its absence. In the external succulent leaf of the shoot in the centre of a spring-onion, where small nodules of callus were found on about half the transverse-septa examined, --that is, where its formation was only just commencing, and where therefore, if anywhere, demonstration of continuity should be possible, --no indication of such could be found (cf. Fig., 6). The same was the case in very young stages where neither callus or pitting was visible. Not infrequently in sections where no continuity of the contents of the vesicular cells was indicated, protoplasmic continuity between the parenchymatous cells was very well shown. In the green leaves pitting is less conspicuous and perforation could never be made out. De Bary says the pits are not perforated, and from the present observations this would seem to be the case in the...
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Product details

  • Paperback | 228 pages
  • 189 x 246 x 12mm | 413g
  • United States
  • English
  • black & white illustrations
  • 1236915690
  • 9781236915696