A first study of the statistics of insanity and the inheritance of the insane diathesis / by David Heron.
- Heron, David
- Date:
- 1907
Licence: In copyright
Credit: A first study of the statistics of insanity and the inheritance of the insane diathesis / by David Heron. Source: Wellcome Collection.
Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.
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![If we suppose that the difficulty of the earlier labours, which is admitted, is in some way correlated with brain injury, it would be more natural to suppose it to lead to idiocy than insanity of the forms with which we are dealing. And the like cause would hardly explain the increased liability of the earlier born members of a family to pulmonary tuberculosis. Whatever may be the actual source of the matter, there appears now to be considerable evidence to show that pathological defect occurs more frequently in the earlier born members of a family than in the later members. Table XXV. Distribution of Siblings. Order of Birth 1 2 3 4 5 6 7 8 9 10 11 12 13 Total Frequency, Insane Stocks ... ... J .315 305 291 249 219 171 134 93 55 35 22 14 5 1908 Expected frequencyl of Insane Members] 77-3 74-8 71-4 6M 53-7 41-9 32-9 22-8 13-5 8 6 5-4 3-4 1-2 468 Actual Frequency ~l of Insane Members/ 108 80 78 71 41 33 19 14 13 5 3 2 1 468 Defect -30-7 -5-2 -6-6 -9-9 + 12-7 + 8-9 + 13-9 + 8-8 + 0-5 + 3-6 + 2-4 + 14 + 0-2 no 100 90 80 70 60 2^ 50 ^ 40 30 20 10 Observer/ Insane Offspring — Expected Insane Offspring 1 2 3 4 5 6 7 8 9 10 11 12 13 Order of Birth](https://iiif.wellcomecollection.org/image/b21295608_0033.jp2/full/800%2C/0/default.jpg)
