[138] It may be recorded here that in the present compilation of the Bibliography of the United States Bureau of Education, the expression formerly used, "Delinquents, Dependents and Defectives", has been dropped in favor of the term, "Special Classes of Persons". On this subject, see Proceedings of National Educational Association, 1901, p. 876. [139] A possibly more serious misapprehension respecting the deaf arises from the impression often current among a large number of people, and apparently encouraged not infrequently in the proceedings of some scientific bodies, to the effect that nearly all deaf-mutes are so either because of a similar condition in their parents or because of the existence in the parents of some physical disease, sometimes of an immoral character. This is in a great part due to the increasing emphasis upon eugenics, with the desire to weed out from the population as many as possible of the "unfit" or "defective". In consequence has been the belief that if there were proper regulation of certain marriages, especially of the deaf and of others suffering from particular maladies, "deaf-mutism", which is looked upon as an excrescence upon society, would in the course of a short time be stamped out. An illustration of this conception is the following extract from the Handbook of the Child Welfare Exhibit held in New York in 1911 (p. 38): "Mating of the Unfit. 'The Law'. Marriages of cousins, insane or feeble-minded, alcoholic, syphilitic parents and effects. The cost--7,369 blind infants, 89,287 deaf and dumb, 18,476 feeble-minded". See also Proceedings of National Conference of Charities and Corrections, 1912, p. 277; Report of Philadelphia Baby Saving Show, 1912, p. 37; _Annals_, lvii., 1912, p. 284. As a matter of fact, as we have already seen, the question of deafness is not one so much of eugenics as of medical science, although eugenics may well be called in play in respect to the marriages of persons under unfavorable conditions, including to an extent the congenitally deaf and those having deaf relatives. The total number of the deaf, however, marrying under unfavorable conditions, is not large. Every effort to remove or diminish deafness is entitled only to the highest praise; but when it is made to appear that deafness generally results from such causes as are often ascribed, it is seen how wrongly the deaf, upon whom a great affliction is already resting, may be made to suffer. [140] P. 45. See also Proceedings of Empire State Association of Deaf-Mutes, xii., 1888, p. 35; National Conference of Charities and Corrections, 1883, p. 416. [141] P. 76. See also p. 96. Similarly Professor C. R. Henderson in his "Dependents, Defectives and Delinquents" says (p. 170): "Many of the deaf and blind are so deficient in industrial efficiency, owing to their infirmity, that they must be cared for in adult life and old age".