As an inexhaustible source of original and instructive material for research workers the Raswan Index stands unique. The alphabetically arranged index covers everything of importance and interest connected with Arabian horses in Desert Arabia, Egypt, Europe, and the Western Hemisphere. Hundreds of pedigrees and breeding charts may be drawn from it. The origin of individual horses, the initial source of any strain, their relationship to distinctive types, to certain breeders, clans and tribes and to Arabian studfarms in Europe and America can be established easily. One may trace the source of foreign blood and its influence upon Arabian studfarms in Europe and America.