10 collection of this sort ever assembled anywhere. It will find also the most substantial collection or Records of Family Traits of better American families to be found anywhere. These records differ from genealogies, which are much more numerous, in that the Record of Family Traits is essentially a human pedigree-record. The inventory will find also that this office is a clearing house and center for data on hereditary traits - physical, mental and spiritual - in man and that it has, in its correspondence file, built up the world's most active group of collaborators concerned in the collection, analysis, and use of home pedigrees. (b) The records will show also that during the early period of this office, when more funds were available for firsthand field-work, the office trained a corps of 258 investigators, many of whom went immediately into professional field work in eugenics, particularly in human heredity, and have since carried on such work in other institutions, especially as teachers of genetics and eugenics, and in the service of state commissions and institutions concerned with reducing certain definite types of hereditary degeneracy and defect within the state's population. (c ) The correspondence files will show also that during the absence of sufficient field workers, the collection of firsthand facts on the identification, measure and family-distribution of natural qualities in man has been conducted successfully by voluntary collaborators. These collaborators are not only individuals concerned with special problems of heredity in their own families or in the families of their communities and states, but also societies such as those concerned with the prevention of blindness and the elimination of hereditary feeble-mindedness within the population, with departments of biology in colleges and universities, and with patriotic societies concerned with the racial welfare of the country.