[28] A detailed study of the language is not presented in this volume. The author has a large collection of texts which will be published at a later date, together with a study of the principal Tinguian dialects. A short description of the Ilocano language, by the writer, will be found in the New International Encyclopædia. [29] A more detailed study of these tribes will be given in a forthcoming volume on Philippine Physical Types. [30] Observations on 13 Ilocano skulls are tabulated by _Koeze_ (Crania Ethnica Philippinica, pp. 56-57, Haarlem, 1901-4). [31] A short series of Igorot skull measurements is given by _Koeze_ (Crania Ethnica Philippinica, pp. 42-43, Haarlem, 1901-4). [32] _Am. Anthropologist_, 1906, pp. 194-195. [33] Notes sur les Chinois du Quang-si (_L'Anthropologie_, Vol. IX, 1898, pp. 144-170). [34] The Races of Man, pp. 384, 577, _et seq_.(London, 1900). [35] _Martin_, Inlandstämme der Malayischen Halbinsel, pp. 237, 351, 358, 386 (Jena, 1905). [36] For measurements on the Northern Chinese and the Formosa Chinese see _Koganei_, Messungen an chinesischen Soldaten (_Mitt. med. Fak. k. japan. Univ. Tokio_, 1903, Vol. VI, No. 2), und Messungen an männlichen Chinesen-Schädeln (_Internat. Centralblatt für Anthropologie_, 1902, pp. 129, _et seq_.). [37] For other observations on Malaysia, in general, see _Annandale_ and _Robinson_ (_Jour. Anth. Inst.,_ Vol. XXXII, 1902); _Keane_, Ethnology (Cambridge, 1907); _Duckworth_ (_Jour. Anth. Inst._, Vol. XXXII); _Hose_ and _McDougall_ (The Pagan Tribes of Borneo, Vol. II, pp. 311, _et seq._) give results by _Haddon_; _Hamy_ (_L'Anthropologie_, Vol. VII, Paris, 1896); _Hagen_, Anthropologische Studien aus Insulinde (Amsterdam, 1890); _Sullivan_, Racial Types in the Philippine Islands (_Anth. Papers, American Museum of Nat. Hist._, Vol. XIII, pt. 1, New York, 1918). [38] _Sullivan_ (_Anthropological Papers, American Museum Nat. History_, Vol. XXIII, pt. 1, p. 42) gives a graphic correlation of Stature, Cephalic and Nasal Indices, which shows a striking similarity between the Tagalog and Pangasinan of the Philippines, and the Southern Chinese. Had he made use of Jenks's measurements of the Bontoc Igorot, that group would also have approached quite closely to those already mentioned. The same method applied to the Ilocano and Tinguian shows them to conform to this type. [39] See Traditions of the Tinguian (this volume, No. 1). [40] The eating of double bananas or vegetables is avoided, as it is thought to result in the birth of twins. The birth of twin girls is a particular misfortune; for their parents are certain to fare badly in any trades or sales to which they may be parties.