=Relation of bacteriology to dairying.= The arts which have been developed by mankind have been the outgrowth of experience. Man first learned by doing, _how_ to perform these various activities, and a scientific knowledge of the underlying principles which govern these processes was later developed. The art of dairying has been practiced from time immemorial, but a correct understanding of the fundamental principles on which the practice of dairying rests is of recent origin. In working out these principles, chemistry has been of great service, but in later years, bacteriology has also been most successfully applied to the problems of modern dairying. Indeed, it may be said that the scienc…
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