MAYORUNA  , a tribe of

South American Indians of Panoan stock . Their country is between the Ucayali and Javari rivers, north-eastern Peru . They are a fine race, roaming the forests and living by hunting . They cut their hair in a line across the forehead and let it hang down their backs . Many have fair skins and beards, a peculiarity sometimes explained by their alleged descent from Ursua's soldiers, but this theory is improbable . They are famous for the potency of their blow-gun poison . MAYO-SMITH, RICHMOND (1854-1901), American economist, was born in Troy, Ohio, on the 9th of February 1854 . Educated at Amherst, and at Berlin and Heidelberg, he became assistant professor of economics at Columbia University in 1877 . He was an adjunct professor from 1878 to 1883, when he was appointed professor of political economy and social science, a post which he held until his death on the 11th of November 1901 . He devoted himself especially to the study of statistics, and was recognized as one of the foremost authorities on the subject . His works include Emigration and Immigration (1890); Sociology and Statistics (1895), and Statistics and Economics (1899) .