he marking off of certain conclusions as alone truly science, whether mathematical or physical, is an historical incident. It sprang originally from man's desire for acertainty and peace which he could not attain practically in the absence of the arts of management and direction of natural conditions. When modern physical inquiry began, it had ahard time to get ahearing, or even to be permitted to carry on. The temp- tation was practically irresistible to treat it as an exclusive and esoteric undertaking. Moreover, as it progressed, it required more and more specialized technical preparation. The motive of defense from social attack and the motive of glorification