At present, the application of physical science is rather _to_ human concerns than _in_ them. That is, it is external, made in the interests of its consequences for a possessing and acquisitive class. Application _in_ life would signify that science was absorbed and distributed; that it was the instrumentality of that common understanding and thorough communication which is the precondition of the existence of a genuine and effective public. The use of science to regulate industry and trade has gone on steadily. The scientific revolution of the seventeenth century was the precursor of the industrial revolution of the eighteenth and nineteenth. In consequence, man has suffered the impact of an enormously enlarged control of physical energies without any corresponding ability to control himself and his own affairs. Knowledge divided against itself, a science to whose incompleteness is added an artificial split, has played its part in generating enslavement of men, women and children in factories in which they are animated machines to tend inanimate machines. It has maintained sordid slums, flurried and discontented careers, grinding poverty and luxurious wealth, brutal exploitation of nature and man in times of peace and high explosives and noxious gases in times of war. Man, a child in understanding of himself, has placed in his hands physical tools of incalculable power. He plays with them like a child, and whether they work harm or good is largely a matter of accident. The instrumentality becomes a master and works fatally as if possessed of a will of its own--not because it has a will but because man has not. The glorification of “pure” science under such conditions is a rationalization of an escape; it marks a construction of an asylum of refuge, a shirking of responsibility. The true purity of knowledge exists not when it is uncontaminated by contact with use and service. It is wholly a moral matter, an affair of honesty, impartiality and generous breadth of intent in search and communication. The adulteration of knowledge is due not to its use, but to vested bias and prejudice, to one-sidedness of outlook, to vanity, to conceit of possession and authority, to contempt or disregard of human concern in its use. Humanity is not, as was once thought, the end for which all things were formed; it is but a slight and feeble thing, perhaps an episodic one, in the vast stretch of the universe. But for man, man is the center of interest and the measure of importance. The magnifying of the physical realm at the cost of man is but an abdication and a flight. To make physical science a rival of human interests is bad enough, for it forms a diversion of energy which can ill be afforded. But the evil does not stop there. The ultimate harm is that the understanding by man of his own affairs and his ability to direct them are sapped at their root when knowledge of nature is disconnected from its human function.