inventions help man to raise himself higher and higher above the animal world and to separate himself from that world in an absolutely definite way. Hence they serve to elevate the human species and continually to promote its progress. And what the most primitive artifice once did for man in his struggle for existence, as he went hunting through the primeval forest, that same sort of assistance is rendered him to-day in the form of marvellous scientific inventions which help him in the present day struggle for life and to forge weapons for future struggles. In their final consequences all human thought and invention help man in his life-struggle on this planet, even though the so-called practical utility of an invention, a discovery or a profound scientific theory, may not be evident at first sight. Everything contributes to raise man