HE belief that more baby boys are born during a period of war seems to be common. We cannot tell how far back goes, but we do know that prevailed during the last century, during the First World War, and that is quite general at present. People frequently remark, Oh, a baby? I bet 'twill be a boy; or, Several of our friends have had babies and of course they're all boys. A physician recently stated to this writer that he had attended at the birth of twelve babies during the last two months and that in every case it was a boy. And the physician asked, Is there any explanation for it? The general implication of all these remarks is that a supernatural influence is at work compensating for the extraordinary loss of men in wartime by increasing the number of male births. In fact, the belief is often expressed in so many words. During the latter part of the last century and the first part of the present one, a number of scholars made systematic inquiries into the matter.2 Diising seems to have initiated the investigation and to have stung several persons into studying the matter by boldly stating that the increase of male births in wartime was such a common phenomenon that no one even thought of questioning it. Naturally, several scholars did question it. The data these early investigators had to work with were fragmentary, ordinarily covering brief periods and single countries. Diising's studies, for instance, covered only the data for Sweden for the period of the Swedish-Russian War of 1789-1790. He did find that the male-female birth ratio was I,048 to ,000o for I788, I,047 in 1789, 1,051 in I790, I,058 in 1791, 1,051 in I792, and 1,037 in 1793. But these findings were not conclusive. Comparable data for Russia
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