Deaf-mutism / by Holger Mygind.

  • Mygind Holger, 1855-1928.
Date:
1894
Catalogue details

Licence: Public Domain Mark

Credit: Deaf-mutism / by Holger Mygind. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    hereditary. Hudson [6i, see 70, p. 515] and Sauveur [67, p. 27] declared themselves more decidedly in favour of the theory of the heredity of deaf-mutism. The latter author considered that, although deaf-mutism is not directly hereditary, it often appears in collateral branches, or after the lapse of one generation or more, this opinion being based on the results of the Belgian statistics of 1835. Wilde is the author who lays the greatest stress upon the hereditabihty of deaf-mutism, declaring that here- ditary taint and family pecuharity are of great im- portance in deaf-mutism [72, p. 472]. Among later authors. Lent is of opinion that deaf-mutism cannot be considered to be hereditary, but that family peculiarity may make itself felt [loi, p. 21]. The author, who has gone most minutely into the question, is Mygge, and he comes to results which are more in favour of the hereditary character of deaf-mutism than against it [122]. Hartmann seems to be of the same opinion [132, p. 54], and Mygind considers hereditary influences to be of great importance in deaf-mutism caused by congenital deafness, although congenital deafness is seldom transmitted directly [189, p. 27] . Opinions have thus differed greatly during the present century, and even now there is no agreement upon the subject. The reason is not only that the laws which govern the hereditability of pathological changes and disease are difficult of interpretation, but that the term heredity is differently employed. The material which forms the basis of the various investi- gations has, too, been very different. In the following pages it will be seen that individual authors have
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