"Permit me to assure you that, while it is not offered in the way of inducement to secure the service asked, since it is barely possible that you can be otherwise than deeply interested in the extension of the bounds of knowledge, full credit will be given you in the work for whatever information you may be pleased to furnish. "This material will be published under the auspices of Prof. J.W. Powell, in charge of the U. S Geographical and Geological Survey of the Rocky Mountain Region. "Communications may be addressed to me either at the address given above or at the Army Medical Museum, Washington, D. C. "Respectfully, yours, "H. C. YARROW." This was forwarded to every Indian agent, physicians at agencies, to a great number of Army officers who had served or were serving at frontier posts, and to individuals known to be interested in ethnologic matters. A large number of interesting and valuable responses were received, many of them showing how customs have changed either under influences of civilization or altered circumstances of environment. Following this, a comprehensive list of books relating to North American Indians was procured, and each volume subjected to careful scrutiny, extracts being made from those that appeared in the writer's judgment reliable. Out of a large number examined up to the present time, several hundred have been laid under contribution, and the labor of further collation still continues. It is proper to add that all the material obtained will eventually be embodied in a quarto volume, forming one of the series of contributions to North American Ethnology prepared under the direction of Maj. J. W. Powell, Director of the Bureau of Ethnology, Smithsonian Institution, from whom, since the inception of the work, most constant encouragement and advice has been received, and to whom all American ethnologists owe a debt of gratitude which can never be repaid. Having thus called attention to the work and the methods pursued in collecting data, the classification of the subject may be given and examples furnished of the burial ceremonies among different tribes, calling especial attention to similar or almost analogous customs among the peoples of the Old World. For our present purpose the following provisional arrangement of burials may be adopted: 1st. By INHUMATION in pits, graves, holes in the ground, mounds; cists, and caves. 2d. By CREMATION, generally on the surface of the earth, occasionally beneath, the resulting bones or ashes being placed in pits, in the ground, in boxes placed on scaffolds or trees, in urns, sometimes scattered. 3d. By EMBALMENT or a process of mummifying, the remains being afterwards placed in the earth, caves, mounds, or charnel-houses.