The B. twins were born on Christmas Day, 1914, the mongol girl having been born first at 3:15 a. m., and the normal boy twenty hours later, both being delivered instrumentally.
In their work on mongolism, Brousseau and Brainerd cite thirty-two cases in one of twins; of these, fourteen were of unlike sex, and in only six of the latter group was the girl a mongol and the boy normal, making this case the seventh of its kind to be reported.
McLean1 reported a case of mongolism in one twin with photographs showing the twins at 6½ months. In this case the boy was the mongol, and the condition was very evident. In figure 1, taken when the B. twins were between 7 and 8 months of age, it will be noticed that the difference is much less marked than in McLean's case, the mongol girl being the farthest from the mother in the picture.
Shattuck RH. MONGOLISM IN ONE TWIN. JAMA. 1929;92(19):1593. doi:10.1001/jama.1929.92700450001010
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