A great amount of documentary manuscript material, mostly of a local character, is contained in the church books of the eighteenth century formerly at the pueblo of Santa Clara and now preserved at Santa Fe through the efforts of the late Archbishop J. B. Salpointe. There are also the "Informaciones Matrimoniales," which contain data of great importance. Through them we are informed of the tragic fate of the last expedition of the Spaniards to the northwest, with its horrifying incidents. The story of woe and disaster that pictures the life of the Indian Pueblos and Spanish settlers during the eighteenth century is contained in fragments in the plain, matter-of-fact church registers, and it requires painstaking investigation to collect it. The greatest part of this information concerns the Rio Grande Pueblos. A careful investigation of the matrimonial and baptismal registers will yield data concerning the clans and indications of the primitive rules of marriage, while the "Libros de Fabrica" contain interesting data on the churches of the Rio Grande valley. Great labor and the utmost scrutiny are required in sifting these time-worn papers for desirable data, and especially is a considerable knowledge of conditions and events necessary; but the result of thorough investigation, especially through literal copying by the student, will amply repay the time and labor bestowed. What I have stated in regard to the church archives applies, in a still greater degree, to the state and private papers that may be accessible. Of the former the archives of Santa Fe contain a great number, though many of them are only fragmentary. Valuable documents exist also in the archives of the Surveyor General at Santa Fe; these are valuable chiefly for historical data covering the first half of the eighteenth century. The national archives in the City of Mexico are much more complete than those of New Mexico, while in Spain we may expect to find an almost complete set of government documents, preserved with much greater care and with more system than in any early Spanish possessions in America. The city of Sevilla would be the first place in which research in this direction should be conducted.