OWING to a number of unforeseen circumstances, mostly beyond our control, an incorrect version of part of our communication under the above title was printed in Nature of December 22, 1951. Our main ...

SCREENING and spin doublets in X-ray spectra are matters of great significance. The formation of these doublets in X-ray diagram lines is now well known and has received satisfactory theoretical ...

Proceedings of the Royal Society of London. Series B, Biological Sciences, Vol. 144, No. 917 (Mar. 13, 1956), pp. 450-459 (16 pages) Filaments of the red alga Griffithsia flosculosa have been examined ...

The Royal Society is a self-governing Fellowship of many of the world's most distinguished scientists drawn from all areas of science, engineering and medicine, and is the oldest scientific academy in ...