The mistake is to think that logic and mathemF\tics are more than machines, or to imagine that you can get out of them or out of philosophy mote than you put into them. Mathematics, logic, are formulre, time-:-savers. Instead of each man traversing the canon, all can go across in a car. The only way to increase knoWledge is to increase experience; the other things are mere aids. If all the time given to metaphysics had been devoted to natural science, we should be in a very different position now. Look at our philosophy to-day, barren, useless, maundering pathologically round the ruins of Aristotle and Kant; follow Professor Rutherford into the laboratory and see the absolute and definite origin of matter.