[98] The references are to his work, Die Seele des Kindes, 4te Auflage.
[99] Champneys and Sigismund are quoted by Preyer. Miss Shinn’s observations are given in her work, Notes on the Development of a Child, p. 238. Mrs. Moore’s are to be found in her Essay, The Mental Development of a Child, p. 37. Dr. L. Hill writes that he noted the first smile in his boy when he was three weeks old, and in his girl when she was some days older.
[100] See especially what he says about an unusual expression, including “a strongly sparkling eye” which occurred in the eighth week, op. cit., p. 194.
[101] I am indebted to Miss Shinn for a sight of her complete original notes; and some of my references are to these.
[102] It is regrettable that Preyer does not describe with some precision the sounds produced by his boy on the twenty-third day.
[103] Miss Shinn insists that the laugh did not develop out of the chuckle, since apparently it appeared, as many articulate sounds appear, with something of a sudden completeness. But this is just what we should expect if the laugh is an inherited movement.
[104] Op. cit., p. 197.
[105] Preyer puts this at the end of the first half-year, which seems to me to be late.
[106] Op. cit., p. 96.
[107] On the point of the priority of the smile in the process of evolution see Th. Ribot, La Psychologie des Sentiments, p. 346.