[44] The writer of the present work is Agent of the Census for America, and will thankfully receive accounts of cases of hallucination of vision, hearing, etc., of which the reader may have knowledge.
[45] Cf. Raehlmann in Zeitschrift für Psychol. und Physiol. der Sinnesorgane, II. 79.
[46] Readers brought up on Popular Science may think that the molecular structure of things is their real essence in an absolute sense, and that water is H-O-H more deeply and truly than it is a solvent of sugar or a slaker of thirst. Not a whit! It is all of these things with equal reality, and the only reason why for the chemist it is H-O-H primarily, and only secondarily the other things, is that for his purpose of laboratory analysis and synthesis, and inclusion in the science which treats of compositions and decompositions, the H-O-H aspect of it is the more important one to bear in mind.
[47] Mental Evolution in Man, p. 74.
[48] Origin of the Emotions (N. Y. ed.), p. 292.
[49] Spalding, Macmillan's Magazine, Feb. 1873, p. 287.
[50] Ibid., p. 289.
[51] Psychologie de l'Enfant, p. 72.
[52] Der Menschliche Wille, p. 224.
[53] Deutsches Archiv f. Klin. Medicin, xxii. 321.