Abstract
F OR the City of Chicago, Petersen has found a greater frequency of conceptions of congenitally malformed individuals during the months of March and April (120 per cent of expectancy), than in July, August, and September.l Throughout the spring months, he also notes a greater variability in barometric pressures than during the summer season. Believing that human protoplasm is more unstable in spring than in summer, he suggests that there may be a cause and effect relationship between the spring variations in barometric pressures and the unusually high conception rate of malformed children observed by him at that time. Recently, the month of conception of 935 congenitally malformed children born in the City of Philadelphia was determined. This information is of interest in the light of Petersen’s conclusions.
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