In a paper filling 210 pages the author, a Swiss physician, now in Geneva, conducts a most laborious review of the inquiries already made by Speyr, Goehlert, and Hellin as to whether the production of twins follows certain families. This can in human beings only be done by studying the records of royal and princely families, which can be traced back for many generations. In following out this method of inquiry it appears that these learned Germans, through imperfect study or want of due attention, have made a number of mistakes which their Swiss critic exposes with unrelenting diligence. He shows that no trustworthy conclusion can be built upon the data which they present. Unhappily, Naegeli's own results are but negative. We are still, he tells us, arranging and classifying our facts. Farther, that we still know nothing about the causes of twins, and will scarcely learn anything in future save by collective investigations through generations.
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