Memoir Upon the Formation of a Deaf Variety of the Human Race (1883) / Chapter Skim
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CHAPTER V
CHAPTER V
Pages 34-40
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From page 34... ...
,ll a * c> M 1 i 1 M «1 "1 "0 1 1 °5 F I G 8 -- Belation between tbn congcDital and non congenital doaf mutes of the coiinlrr, according to the Kov Fied H Wines Tbe congenital deaf mutes are indicated by the dark line, the non congenital, b\ tbe hgbt line 35
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From page 35... ...
The apparent maximum at seven is not the actual maximum; the actual maximum is at some younger age not yet ascertained." In the above diagram those portions of the curves that are believed to be unreliable from this cause are indicated by dotted lines I t will be observed that among the older deaf mutes the congenitals are more numerous than the non congenitals; whereas among the younger the reverse appears to be the case. There is no apparent diminution in the numbers of the congenitally deaf born of late years; and the reversal of the relation between the two classes must be attiibuted to an abnormal increase in the number of those who became deaf from disease or accident.
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From page 36... ...
in the decade 1860 to 1809, continuing m the last decade, 1870 to 1879. The pupils who became deaf from cerebro spinal meningitis and from scarlet fever are classified according to the period when deafness occurred in the lower diagrams of Fig.
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From page 37... ...
ou J taut vUon 40 to 30 too 1 300 « 1 SO / -« f l \ 80 /9 t \ to 1 eo 1 ^ r \ w 1 « ff 1 -- 1 to t 1 1 30 1 too 1 m so 1 \ 1 so eo 1 30 \ M t 1 30 20 1 s \ 1 I 1 1 1 I 1 1 I § \ i 1 Period *
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From page 38... ...
i ^ > 1 1 1 1 1 ^1 1 1 1 1 >5 <5> 5? SI 11V ^ 1 P I G 11 -- The dark line indicates the denf mates who have both parents deaf Tbe lower light line represents those who have one parent deaf, and tho upper line the total number of deaf mutes returned who have one or both parents deaf No deaf-mute having both parents deaf has been returned who was born before the year 1832.
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From page 39... ...
12. The ordinates represent the percentage of the whole who were born in the decades indicated by the abscissfe I f we assume that the numerical relation now existing between congenital deaf-mutes and hearing persons of the same age approximately repiesents the proportion of the congenitally deaf to the whole population born at the period when they were born, we have a means of comparing the growth of the congenitally deaf population with that of the population at large.
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From page 40... ...
of deaf mutes who are the children of deaf mates The ordinates of the corves represent the percentage of the whole who were born in the decades indicated by the abscisste represents population of the United States represents congenital deaf mutes of the United States represents deaf mutes who are the children of deaf mutes represents portion of the curves known to be unreliable on account of incomplete returns 1771-1780 781-1770 1771-1800 181-1820 1821-1830 I83l-I8h0 I8m-I850 1851-1860 1861-1870 1871 - 1 8 8 0 S
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