. Fic. 90—A knob-like elevation of the mucosa due to several contiguous nodules. (Thorns.) into the vulvae of supposedly sound heifers, and believed that he produced the disease. It is a notable fact that in Ostertag's experiments, while he believed he had trans- mitted the disease to cows and heifers by means of pure cultures, he failed to transmit it to sheep, goats, and swine, although they regularly suffer from it. It is not clear, however, just what he accomplished. Doubt is thrown upon

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectveterin, bookyear1921