[123] Biometrika, IV, pp. 13–104, 1904.

[124] Donaldson, H. H., A Comparison of the White Rat with Man in respect to the Growth of the entire Body, Boas Memorial Vol., New York, 1906, pp. 5–26.

[125] Besides many papers quoted by Dubois on the growth and weight of the brain, and numerous papers in Biometrika, see also the following: Ziehen, Th., Das Gehirn: Massverhältnisse, in Bardeleben’s Handb. der Anat. des Menschen, IV, pp. 353–386, 1899. Spitzka, E. A., Brain-weight of Animals with special reference to the Weight of the Brain in the Macaque Monkey, J. Comp. Neurol. XIII, pp. 9–17, 1903. Warneke, P., Mitteilung neuer Gehirn und Körper­gewichts­bestim­mungen bei Säugern, nebst Zusammenstellung der gesammten bisher beobachteten absoluten und relativen Gehirngewichte bei den verschiedenen Species, J. f. Psychol. u. Neurol. XIII, pp. 355–403, 1909. Donaldson, H. H., On the regular seasonal Changes in the relative Weight of the Central Nervous System of the Leopard Frog, Journ. of Morph. XXII, pp. 663–694, 1911.

[126] Cf. Jenkinson, Growth, Variability and Correlation in Young Trout, Biometrika, VIII, pp. 444–455, 1912.

[127] Cf. chap. xvii, p. 739.

[128] “ ...I marked in the same manner as the Vine, young Honeysuckle shoots, etc....; and I found in them all a gradual scale of unequal extensions, those parts extending most which were tenderest,” Vegetable Staticks, Exp. cxxiii.

[129] From Sachs, Textbook of Botany, 1882, p. 820.

[130] Variation and Differentiation in Ceratophyllum, Carnegie Inst. Publications, No. 58, Washington, 1907.

[131] Cf. Lämmel, Ueber periodische Variationen in Organismen, Biol. Centralbl. XXII, pp. 368–376, 1903.

[132] Herein lies the easy answer to a contention frequently raised by Bergson, and to which he ascribes great importance, that “a mere variation of size is one thing, and a change of form is another.” Thus he considers “a change in the form of leaves” to constitute “a profound morphological difference.” Creative Evolution, p. 71.