Somewhat over a year ago the Society received, through the kindness of Mr. Charles P. Howland, Director of Research, Council of Foreign Relations, New York City, a fine collection of Mexican manuscripts. The material falls into two distinct groups—113 volumes, the records of Alfred and Andres Lefebvre, who were engaged in both retail and wholesale trade in Mexico City, and 27 volumes, the records of the Hacienda de San Bartolomé del Monte, Provincia de Tlaxcala, Mexico, which was owned by Don Manuel Fernandez del Castillo y de Mier. This article will concern the records of Alfred and Andres Lefebvre, which cover the years 1863–1900.