[123] Of course, increase of volume might arise through a widening of the sensational factor in the experience, due to the larger diffusion of somatic stimulation, which, as already remarked, is an element in the expansion of laughter. [124] This expression is commonly used only where an expression is passed on to a palpably dissimilar feeling. But an essentially similar process takes place, according to my view, within the limits of development of what we call the same emotion. [125] The application of the principle of arrest to the changes in emotional states has been made with great success by Th. Ribot in his volume, _Psychologie des Sentiments_, p. 260 ff. [126] Miss Shinn’s observations are recorded in Parts III. and IV. of her _Notes_. [127] For a pretty reminiscent description of a first experience of running and jumping, see Pierre Loti, _Roman d’un Enfant_, ii., p. 4 ff. [128] The nearest approach I have met with to a suggestion of a wish to inflict pain in this early practical joking is the following: The child M. when two years old stood on her mother’s foot saying, “Oh, my poor toe!” But it seems reasonable to say that in such moments of frolic pain is quite unrepresentable. [129] _Op. cit._, p. 196. I have heard of it occurring in a girl at the age of three and a half. The point should certainly be determined by more precise observations. [130] Preyer first observed roguish laughter at the end of the second year (_op. cit._, p. 196). He does not define the expression “schelmisches Lachen”. [131] Compare above, p. 83. [132] See Mrs. Hogan’s _Study of a Child_, p. 18. [133] _Cf._ what was said in chap. v., p. 142, apropos of Leigh Hunt’s theory. [134] Ruth’s laughter at the mother’s face was certainly very early. [135] Hogan, _op. cit._, p. 71. [136] See my _Studies of Childhood_, pp. 274–5. [137] Most of the observations here quoted, on the laughter of the boy C., have appeared before in a chapter of my volume, _Studies of Childhood_. The reader who is familiar with this chapter will, I feel sure, pardon the repetition. [138] Rev. Duff Macdonald, _Africana_ (1882), i., pp. 266–7. [139] It is true that this astounding proposition is answered somewhat ironically by Rev. Dr. Folliott, who says, “Give him modern Athens, the learned friend (Brougham) and the sham intellect Society—they will develop his muscles”. Yet it seems odd that this confident assertor was not taken to task for his amazing ignorance. [140] The dispute may be followed by the curious by turning up the following: _Indian Antiquary_, vol. viii., p. 316; cf. E. Deschamps, _Pays des Veddas_, pp. 378–9; _The Taprobanian_, vol. i., p. 192 ff. The German visitor, Sarasin, upholds the writer in the latter periodical, and says that the Veddas “lachen gerne,” though some of them are bad tempered, and laugh but little. _Naturforschungen auf Ceylon_, pp. 378 and 540. [141] Carl von den Steinen, _Unter den Naturvölkern Zentral-Brasiliens_, p. 61.