Another value they have,... and it is one which will be properly appreciated by any student of languages. They are, by common consent of all competent authorities, the genuine productions of native minds, cast in the idiomatic forms of the native tongue by those born to its use. No matter how fluent a foreigner becomes in a language not his own, he can never use it as does one who has been familiar with it from childhood. This general maxim is tenfold true when we apply it to a European learning an American language. The flow of thought, as exhibited in these two linguistic families, is in such different directions that no amount of practice can render one equally accurate in both. Hence the importance of studying a tongue as it is employed by natives; and hence the very high estimate I place on these “Books of Chilan Balam” as linguistic material--an estimate much increased by the great rarity of independent compositions in their own tongues by members of the native races of this continent.[2] [Footnote 2: Brinton, D.G.: The books of Chilan Balam 10, Philadelphia, n.d., (1882).] The same author, in speaking of the internal evidences of authenticity contained in the Popol Vuh, the sacred book of the Kichés, uses the following words, which apply equally well to these Cherokee formulas: To one familiar with native American myths, this one bears undeniable marks of its aboriginal origin. Its frequent puerilities and inanities, its generally low and coarse range of thought and expression, its occasional loftiness of both, its strange metaphors and the prominence of strictly heathen names and potencies, bring it into unmistakable relationship to the true native myth.[3] [Footnote 3: Brinton, D.G.: Names of the Gods in the Kiché Myths, in Proc. Am. Philos. Soc., Philadelphia, 1881, vol. 19, p. 613.]