[underscore]3. Clinical Service in Human Heredity. (a) Kinds of inquiries.[end underscore] Persons, who are faced with or who are especially concerned with a particular problem in human heredity, supply the essential genetical facts which include a description of a given trait in the particular central figure of the pedigree, they name also several near-kin with a description of the presence or absence or the degree of development of the same and allied subject-trait in each named near-kin, and then put the question, "With this distribution of this quality among the near blood-kin, what are the probabilities that this particular trait would appear, and to what degree, among the children of the particular mating (duly located) in the pedigree?" [underscore](b) Nature of answers.[end underscore] By reference to the archives of the Eugenics Record Office the stock of families which show the distribution of the particular subject-trait are sorted out, and the evidence of these several families which present cases parallel to the subject-family is summarized and the findings are given to the inquirer. The answer does not include advice, but states as accurately as possible the behavior of Nature in reference to the inheritance of the particular subject-trait, and it analyzes the probabilities of the particular trait being transmitted along certain branches of the specified family tree. It is left to the judgment of the particular inquirer to apply such knowledge as he sees fit. If the term "Marriage Clinic" were used, doubtless, such advice rather than the supplying of facts of Nature's behavior would be the sort of service which the clinic would be expected to render. [end]