A Simple Device for Short Photographic Exposures.

skillful questioning of the Scottish Highlands drew forth revealing answers, telling of the origin of mountain ranges and their evolution in the past. SIR JOSEPH BARCROFT-An investigator of many phases of the respiration of higher animals; a beloved guide to younger men on both sides of the Atlantic. FRIEDRICH BERGIUS-A modern magician; his knowing touch transforms coal to oil. NORMAN LEVI BOWEN-A scientific Vulcan, in his laboratory furnaces he measures those forces which once formed our igneous rocks. RUDOLF CARNAP-A philosopher of penetrating insight, who lights the way for those who seek through logic the unity of the world. :LIE JOSEPH CARTAN-A versatile investigator in the realm of pure thought; a mathematician who has advanced his science on many fronts. JAMES BERTRAM COLLIP-A skillful biochemist; a bold explorer among the tangled complexities of the internal secretions. ARTHUR HOLLY COMPTON-A physicist who forces light itself to illumine the dark secrets of its still mysterious nature. PETER DEBYE-A large-hearted physicist who gladly lends the chemist a helping hand by elucidating the electrical properties of matter. LEONARD EUGENE DICKSON-A fruitful speculator on the significance of numbers; an algebraist noted for his stimulating work. SIR ARTHUR STANLEY EDDINGTON-A student of the cosmos who peers within the atom and surveys the expanding universe, an expounder to the multitude of the poetry of modern science. HANS FISCHER-A master builder of molecular structure whose labors tell us why grass is green and blood is red. RONALD AYLMER FISHER-A student of heredity who has improved statistical methods and assisted agriculture by the application of his science. CORRADO GINI-A versatile sociologist and statistician who early turned his attention to that most vital problem, the growth of populations. GODFREY HAROLD HARDY-A British mathematician who has led the advance to heights deemed inaccessible by previous generations. Ross GRANVILLE HARRISON-An embryologist whose method of transplantations yields new insight into the process of development. JOHAN HJORT-The naturalist of the northern sea, whose studies and explorations have benefitted alike the science of biology and the fisheries of his native land. SIR FREDERICK GOWLAND HOPKINS-From John Har-vard 's university, the discoverer of the vitamins, a pioneer in many fields, whose work stands as a symbol of the ceaseless adventure of the human mind. BERNARDO ALBERTO HOUSSAY-A physiologist noted for his studies of the ductless glands, a leader of science in the New World to the south. PIERRE MARIE FELIX JANET-A pioneer in studying the multifarious …