[15] Quétélet, Proporzioni medie (mean Proportions).
[16] Livi, Antropometria Militare (Military Anthropometry).
[17] Montessori, Caratteri fisici delle giovani donne del Lazio.
[18] Translator's note.
[19] Fig. 25 and those following it, dealing with deformities resulting from labour, are taken from Pieraccini's great work, The Pathology of Labour.
[20] Pieraccini, Op. cit.
[21] Alfredo Niceforo, Les classes pauvres (the poorer classes).
[22] Taken from Livi: On the Development of the Body in relation to the profession and the social condition. Rome, Voghera, 1897.
[23] Marro, Puberty.
[24] Cited by Pagliani, Human Development, according to age, sex, etc.