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Nature volume 127, page 373 (07 March 1931) | Download Citation



PROF. DÉJARDIN'S “modeste ouvrage” is actually an exceptionally good account of quantum theory, in which he shows a nice appreciation of the extent to which mathematics can be tolerated by the ordinary honours student of physics. The course followed is the historical one, the radiation problem being taken first, and, after that, specific heats, the photoelectric effect, the scattering of X-rays, elementary spectroscopic theory, and, finally, the new quantum mechanics. Details of experiments are not given, but there is no lack of illustrative results, generally from fairly recent publications. There is a great deal to be said for the omission of such details even from more pretentious treatises, the student being left to refer to original papers for these—with, of course, precise directions as to what he is to read. Prof. Djardin has succeeded in covering much ground in this small and inexpensive volume, which, if read in conjunction with P. Bricout's “Ondes et électrons” in the same series, furnishes a very satisfactory course on modern physics.

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