[25] Raciborski, cited by Marro, Puberty.
[26] Idem.
[27] Rousseau, Émile, cited by Marro.
[28] It should be noted that sexual precocity or vice retards the development of puberty, while healthful psychic stimuli are favourable to it. Hence it was a right instinct that led us to give the name of sin and vice to what retards the normal development of life, and virtue and honour to what is favourable to it.—Author's note.
[29] Compare The method of Scientific Pedagogy applied to infantile education in the "Children's Houses," Montessori: Casa Editr. Lapi, 1909.
[30] Moige, Nouvelle Iconographie de la Salpétrière, 1894.
[31] Apert, Op. cit.
[32] Cited by Marro.
[33] Cited by Figueira, Semejotica Infantile, p. 121.
[34] Cited by Figueira (Rio Janeiro) in his volume, Elementi di Semejotica infantile, 1906. From this volume, which contains the result of the most modern investigations in pediatry, I have taken a number of data regarding the weight of children.