[3] Materials, p. 118.
[4] Church, A. H., On the Relation of Phyllotaxis to Mechanical Laws, London, 1904.
[5] It is a question whether the dominance of the palmatifid leaf over the pinnatifid is not really an example of the dominance of a lower number of segmentations over a higher. From the uncertainty whether two given leaves of two separate plants are actually comparable one cannot institute quite satisfactory numerical comparisons, but I think the view that the "Fern" leaf has more lobes than an otherwise similar "Palm" leaf may be fairly maintained. If this be admitted, the "Palm" leaf represents the dominant low number and its round shape is a consequence of the greater powers of growth which are so often possessed by the members of a shorter series.
[6] It is perhaps of importance to remember that in certain species of bacteria (e. g. Bacillus Anthracis) division may cease where the organism is cultivated under certain artificial conditions though growth continues. In this way very long unsegmented threads are produced.
[7] Arch. f. Entwm., XX, 1905, p. 76; Sitzungsb. d. Ges. Naturf., Berlin, 1907, p. 41, etc.
[8] Borradaile, L. A., Jour. Marine Zool., 1897, No. 8.
[9] Dr. Przibram, I should mention, concludes that on the whole the facts are against this interpretation, but as more evidence is certainly required, I call attention to the possibility.
[10] Morgan, T. H., Regeneration, 1901.
[11] It would be interesting to know whether growth continues at the original posterior end after the new "posterior" end has been formed in front.
[12] In the actual case observed, the ripples unsmoothed had a wave-length of about 2-1/2 inches; and when the new ones were first formed, there were about 30 ridges in the length originally traversed by 15 or 16.