Those who have never attempted to secure photographs and measurements or other details of the physique of Indians, in short, any reliable statistics of individuals or bands, can hardly realize the obstacles to be overcome. The American Indian is extremely superstitious, and every attempt to take his picture is rendered difficult if not entirely frustrated by his deeply-rooted belief that the process places some portion of himself in the power of the white man, and his suspicion that such control may be used to his injury. No prescribed regulations for the taking of photographs, therefore, are likely to be fully carried out. As a rule, front and profile views have been secured whenever practicable. Usually it is only when an Indian is subjected to confinement that those measurements of his person which are suitable for anthropological purposes can be secured. In most cases the Indian will not allow his person to be handled at all, nor submit to any inconvenience whatever. Much tact and perseverance are required to overcome his superstitious notions, and in many cases, even of the most noted chiefs of several tribes, no portrait can be obtained by any inducement whatever. If, therefore, the collection fails to meet the full requirements of the anthropologist, it must be remembered that the obstacles in the way of realizing his ideal of a perfect collection are insurmountable. About two hundred of the portraits, or one-fifth of the whole collection, have been derived from various sources, and most of these are pictures of Indians composing the several delegations that have visited Washington from time to time during the past ten years. Such individuals are usually among the most prominent and influential members of the respective tribes, of which they consequently furnish the best samples. The greater portion of the whole collection is derived from the munificent liberality of William Blackmore, esq., of London, England, the eminent anthropologist who has for many years studied closely the history, habits, and manners of the North American Indians. The Blackmore portion of the collection consists of a number of smaller lots from various sources; and it is Mr. Blackmore's intention to enlarge it to include, if possible, all the tribes of the North American continent. The entire collection, at the present time consisting of upward of a thousand negatives, represents ten leading "families" of Indians, besides seven independent tribes, the families being divisible into fifty-four "tribes," subdivision of which gives forty-three "bands." The collection continues to increase as opportunity offers.