Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from a very strange experience. Everyone at that time imagined the atom as a "plum pudding." That is ...

THIS book gives a very complete account of the ... and the important role of exchange therein is treated. The Theory of Atomic Collisions. By N. F. Mott Dr. H. S. W. Massey.

ENGLISH readers will welcome this authoritative account by Prof. Bohr of the application of his theory to atomic structure. The essay has been translated from the Zeitschrift fur Physik by L.