in Professor Nocard's book lies in the demonstration of the small part played by heredity, and the great part played by contagion, in the propagation of bovine tuberculosis. It seems not unreasonable to suppose that the same is the case for human tuberculosis, and that, if the children of tuberculous parents were protected from infection by cohabitation or ingestion, the importance of heredity as a cause of the disease, or even of the predisposition to it, would dwindle away into

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... In Denmark, Professor Bang has shown how comparatively easy it is to protect cattle from infection, and how a healthy herd may be bred from a severely infected one.