[13] Dr. Delange mentions a peculiar social habit or custom among a tribe of Arabians that in a sociological sense is worth mentioning. He observes that for these dances females are preferred, but owing to the peculiar habit about to be related it is impossible to have any of the village women in Algeria assist at this part of the festivities; hence the men have to do the dancing. It appears that the females of one tribe--this being the tribe of Ouleds-Nails, who live on the southern borders of Algiers--are in the habit, when young, of emigrating to the oases of the Sahara, which are occupied by the French and traveling Arabs, where they give themselves up to a life of prostitution. After having exercised this life for some years they return to the tribe with a dowry in money, besides an ample supply of clothes and jewelry,--the result of their economy,--which enables them to contract favorable marriages. This practice is so common in this one particular tribe, and so much have they monopolized the profession of courtesan, that the name of the tribe of Ouleds-Nails is in Arabia synonymous with that of courtesan. These young women dance every evening in the Arab cafes, and are at times employed to do the dancing at Arab feasts. For this reason no self-respecting Arab woman ever allows herself to dance in public, or why the practice of both sexes dancing together is not practiced in Algerian villages, as a man would thereby consider himself disgraced.--Dr. Delange, in _Receuil de Memoires de Medecine de Chirurgie et de Pharmacie Militaire_, No. 105, August, 1868. [14] "Tractatus, Alberti Bobovii, Turcarum Imp. Mohammedis IV olim Interpretis primarii, De Turcarum Liturgia, peregrinatione Meccana, Circumcisione, AEgrotorum Visitatione," etc. Oxonii, 1690. [15] Michel Le Feber. "Le Theatre de la Turquie." Paris, 1681. [16] "La Circoncision, Sa Signification Social et Religieuse." Par M. Paul Lafargue, in the _Bulletins de la Societe d'Anthropologie de Paris_. Tome x, 3d fascicule, Juin a Octobre, 1887. [17] "Circumcision." By A. B. Arnold. _New York Med. Record_, Feb. 13, 1886. [18] Bancroft's "Native Races," vol. ii, page 278. [19] "Recherches Philosophiques sur les Americains, ou Memoires Interessants pour servir a l'Histoire de l'Espece Humaine." Par M. de P. Edition par Dom Pernety. Tome ii. Article, Circoncision, Berlin, 1774. [20] "The Family, a Historical and Social Study." By Charles Franklin Thwing. Boston, 1887.