As regards wireless broadcasting, it is too early to speak of its permanent effects. It has come upon us like an avalanche. For the first time, it has enlisted youth in the highest electrical problems. It has paved the way for the general diffusion of scientific knowledge while ostensibly popularizing the art of music. In any case, it is a complete answer to Ben Akiba and his saying about there being nothing new. Mr. J. B. S. Haldane[2] believes that the centre of scientific interest now lies in biology, and that physiology will eventually invade and destroy mathematical physics. It is quite possible that the advance of what physicists sometimes playfully call the “inexact” sciences may cast those of physics and chemistry entirely in the shade, but although biology has made some difference to human life in the last generation, its effects cannot remotely compare with those of physical and chemical discoveries. The mere increase of speed in transport, due to the internal-combustion engine, has caused a speeding-up of the whole nervous system and a brightening of the intelligence of all but an insignificant fraction of the population. When the choice lies between the Quick and the Dead, even the most sluggish temperament will put on a spurt, and this continued sprinting across the motor traffic has produced a more agile generation. If such a profound difference can be made in twenty years, what will be the effect of even 200 years of continually accelerated progress? [2] _Dædalus_, pp. 10 and 16. The continual acceleration of the rate of progress must not be lost sight of in forecasting the future. It happens to coincide with a similar increase in the consumption of accumulated fuels, like coal and oil, and might be expected to slow down when those supplies of preserved sunlight come to an end. But by that time other accumulations will no doubt have been discovered and utilized. Unless the Russian blight extends over Europe and America, we may confidently look forward to a long era of steadily accelerated progress. What form that progress will take is notoriously difficult to forecast. The main difficulty arises from the fact that the most promising discoveries sometimes turn out to be impracticable, or at least of quite secondary importance. Nobody prophesied the great development of the motor car, nor of that gigantic child of the old Zoetrope or “Wheel of Life” which we call the Picture Theatre. A genius like H. G. Wells could indeed write a marvellously accurate forecast of flying achievements, but in one of his books he makes a great deal of the Brennan mono-rail, which, after a sensational beginning, failed to reach maturity, probably owing to the temporary failure of that much-maligned but quite essential fertilizer of inventions, capital. Other inventions, such as the speaking film, bear within themselves certain weaknesses which may prevent them from attaining great popularity.