In the modern sphere of natural science the most outstanding feature of agricultural research in recent years has been the intro- duction of physics and mathematics; the former in connexion with chemical and physiological problems, the latter in regard to me- thods of reasoning, including the statistical examination of approxi- mate results. In other words, there has occurred an extension in the breadth of outlook in agricultural science, greater accuracy, and a breaking down of the arbitrary lines of demarcation which formerly existed between the mathematical sciences and biology. The result is that old problems are now being approached from en- tirely new points of view, and fresh knowledge is being secured which would never have been gained by means of the approximate and conservative methods that were in vogue for so long. How has this come about? It has come through an evolutionary process that has led to the recognition, especially in the United States of America, that the problems of agriculture are so varied and abstruse that they can only be solved by original work on the part of highly trained men in every department of science.
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