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have a much more extensive series of observations, including controls on non-sterile patients. As one reviews the literature of sterility, it is a striking fact that large contributions have been made by two groups of people who are not physicians. The first of these are the pure biologists and the second the stock-breeders and veterinarians. We can take certain leaves from the book of each group. Particularly interesting are such observations as those made by Cuénot and by Castle and Little ondoi:10.1056/nejm192210121871504 fatcat:7azihga37nhoznb3buihmadp6e