No scientist can know without making an effort, without taking an interest; and in his effort there is usually even a certain amount of self-interest involved. The engineer studies things mainly from a practical point of view. So does the farmer. Practice is not the enemy of theoretical knowledge but the most valuable incentive to it. Though a certain amount of aloofness may be becoming to the scientist, there are many examples to show that it is not always important for a scientist to be thus disinterested. But it is important for him to remain in touch with reality, with practice, for those
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