[38] Compare F. von Höhnel, Bot. Zeitung, 1879, p. 318.
[39] This is also shown by experiment xc, Vegetable Staticks, p. 123.
[40] The method by which Hales proposed to record the depth of the sea is a variant of this apparatus.
[41] Vegetable Staticks, p. 92.
[42] According to Sachs (Geschichte, p. 509) Ray employed this method.
[43] Other facts show that the "gapped" branches did not behave quite normally.
[44] He refers (p. 141) to what is in principle the same experiment (see Fig. 27) as due to Mr Brotherton, and published in the Abridgment of the Phil. Trans. ii. p. 708.
[45] He notices that the swelling of the bark is connected with the presence of buds. The only ring of bark which had no bud showed no swelling.
[46] It appears that Mayow made similar experiments. Dict. Nat. Biog. s.v. Mayow.
[47] History of Chemistry, 1909, i. p. 69.