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directions. This advance has been largely connected with teclmical improvements in the microscopes for counting scintillations, due largely to Doctor Chadwick and the skilled assistance of Mr. Twyman, of Hilger and Company. In the last few months, by a modified method, we have found that all elements from fluorine to potassium can be disintegrated by o~-particles. The atoms of hydrogen, helium, lithium, carbon, and oxygen show no appreciable effect under the conditions of our experiments. This, however, brings us up to later days, and I must close this brief, and I am afraid very inadequate tale, of the genesis and development of some of my researches in the field of radioactivity. If time had permitted me, I would like to have given you the history of many important new lines of work which were initiated by my co-workers in the laboratory, particularly of the fundamental researches of Moseley on. the X-ray spectra of the elements and of the initial stages of Bohr's great theory of the electronic structure of the atom. It was an abiding pleasure to me to watch the unfolding of the new ideas of Moseley and Bohr which have exercised such a profound effect on the history of atomic science of our day.
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