Show Daily Health Health Servi Daiy 13 Deafness Is Frequently Inherited Survey 5 By DR DR MORRIS EIN EINA A certain of inability to hear is i apparently due to Inheritance of ot characteristics which make hear hearing hear hear- ing tag impossible Some hardness of hearing results result from disease and develops develops de dc de- de after aler birth birt On the other hand a considerable portion of deafness deaf deaf- der ness Js present at birth and nd represents disorders of the structures involved Involve in hearing i If I hearing herIng is i impossible the child will ordinarily not learn lear to speak peak Such wi a child however must be taught to speak and ay also alo be b taught lip lp reading when it develops itel- itel intelli- intelli gence One of the most comon common causes cau of deafness Is i the di disease ase caled called rosis roisa a condition which begins begin about middle life me and gradually prevents prevent hearing through h changes that take place in the tissues tues involved In hear hear- hea ing ig Recently W. W J. J Tinkle has made a study tudy of inherited deafness deanes finding findig of some some families in which hardness hardne hearing h has come through four gen rca In the records of t the Ohio Oho state school schol for the deaf there were found round re reports rt concerning 31 families mi in which both parents were deaf were and at least leat one child chUd was wa in an tom tion to In about abut two thirds two third of the c eases cases c in which both parents are are deaf dei the thc children can hear in third one however how ever the children are also alo deaf dea The available evidence indicates indicate that hereditary deaf and the te tat tendency to are inherited inherited ie but that the characteristic is i what is i called caled a a repressive characteristic character character- and tends to be bred bre out of the race If deaf persons are arc able abl to marry those I who hear such hereditary heredi tary Lary try deafness will wi be b gradually uch eli dim If U a deafened deafen person marl marries one who hears well ell wel and who h has no deaf dea relatives or marries marrie a person peron who has ha lost his hearing due to some acute disease and has ha no deaf relatives the danger danger- of having children who are also alo deaf dea is i slight However Hoever when people who are deaf der marry people who are also al deaf det third one-third of the children are re also ao deaf deat There are arc no criteria for distinguishing just jut which parent parents of this thi type tye will wi have children n who hear well wel and an which ones will wi have children do not Dr Tinkle therefore suggeSts suggest sue ever every possible measure be b empl to promote marriage between betwee t ened people and those who pear e ed and d that one Important step i direction is to stop deaf deat If the te i teaching of ot lip lipis lp yeS re reis is promoted promote and If I more deaf dett made to teach those tho who are dea the deaf will be tak to speak dea wi tf t and of their condition a M tendency toward hereditary y d db de def be b largely controlled 1 |