Abstract
A previous communication (Mittwoch, 1957) contained evidence that the leucocyte count in children with mongolism showed certain abnormalities. Although the total count was not affected, the lymphocyte count was lower and the neutrophil count seemed somewhat higher than in a comparable control group. It will be shown in the present paper that these differences between mongol and non-mongol children are dependent on age, and that the gradual drop with age of the lymphocyte count, which is found in normal children (Kato, 1935), does not occur in children with mongolism.

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