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ALTHOUGH it has been suggested that Alzheimer's disease is not uncommon Lowenberg and Waggoner (1934) have described such an example coming under observation at the age of 32, and reference was made in a discussion on presenile dementia between the sections of Neurology and Psychiatry of the Royal Society of Medicine in 1933 to " data suggestive of senile and presenile types of dementia in the direct ancestry of a number of patients " (Gillespie et al., 1933). Lowenberg has also noted the occurrence of senile dementia in a father and Alzheimer's disease in the son.
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McMenemey et al. (1939) studied this question.
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