SCIENTIFIC PROGRESS, by Sir James Jeans, Sir William Bragg, E. V. Appleton, E. Mellanby, J. B. S. Haldane & Julian Huxley. (Sir Halley Stewart lecture, 1935) © 3Sep36, AI-21836; 13Oct36, A99360. Macmillan Co. (PCW); 17Oct63; R323938.