Studies; Reprints Volume 28

Studies; Reprints Volume 28

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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. 1918 edition. Excerpt: found that the leaf without stem had produced a larger mass of shoots than the leaf with a piece of stem attached. The latter is then removed from the leaf and weighed. It is invariably found that it has increased in weight and that this increase approximately equals the diminution in the mass of shoots in the leaf under the influence of the stem. The following may serve as an example. Three sets of experiments were made simultaneously on 6, 7 and 7 pairs of sister leaves prepared in the way described above; one leaf was without stem and the other with one half of the split stem. The three experiments differed in regard to the length of the stem, which was in the three experiments 2 (A), 1 (B) and 0.5 cm. (C), respectively. The leaves dipped with their apices in water. The results are given in Table I. In this table we call the difference in the mass of shoots produced in the leaves without and with stems the inhibit' ing action of the stem. This quantity should equal approximately the sum of the mass of shoots produced in the axil of the leaf attached to the stem plus the increase in weight of the stem attached to the leaf during the duration of the experiment. The ratio of the two values should therefore approximately equal 1 (Table I.). The experiments show that within the limit of error the mass of the stem increased in such a way as to approximately equal the inhibiting effect of the stem on shoot production in the notches of the leaf. The mass of roots produced in the leaves is neglected since it is small compared with the mass of stems., It is almost impossible to split the living stem so perfectly that the two pieces are absolutely equal and in this way an error creeps in which can only be eliminated by a large number more

Product details

  • Paperback | 186 pages
  • 189 x 246 x 10mm | 340g
  • United States
  • English
  • black & white illustrations
  • 1236828569
  • 9781236828569