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DARWIN'S theory of the origin of species presupposes the occurrence of occasional variants from the parent stock, of which some are preserved and fostered by natural selection. The cause of this… (More)
The principal shell variation in the snail Cochlicella acuta is described in terms of banding, extra-band opacity and ground colour. A nomenclature like that used for Cepaea is adopted for the… (More)
WE are all so much entertained by Prof. H. E. Armstrong's broadside attacks that those of us who happen to come within his range must not complain; but I feel that I must protest against his… (More)
WHATEVER view is held regarding the nature of light, it must. now be admitted that the process whereby an atom loses radiant energy, and another near or distant atom receives the same energy, is… (More)
THE theory that light is a series of spherical waves progressing from the source with velocity c, and the theory that light is a group of corpuscles moving in straight lines from the source with… (More)