may seek inspiration and which the reader interested in matters of science will likewise consult with satisfaction."
Of the two initial contributions to the series, the first examines, with the freedom of thought permitted by an avowed speculative analysis, the fundamentals of the nature of matter and of radiation. Under this general title the authors review the modern conceptions of space, time and matter. In particular they dwell especially upon the quantification of space and of time, and further, upon a quantified universe. The idea of continuity, the Bohr principle of correspondence, 3-and ~,-rays, and the structure of the electron receives attention.
The second volume, on tl-.e theory of light quanta, aims to diminish some of the difficulties which are encountered in reconciling the two principal theories of optics, the wave theory, and that of light quanta. To that end, light quanta are considered in a medium devoid of all matter, the mechanism itself of the emission being disregarded. The structure of light quanta is examined in detail, its eneigy, and the general relation between this energy and the frequency are calculated. The phenomena of interference are considered and the manner in which the type of quantum adopted is applicable to an explanation of interference is discussed.
The rational and deductive character of these first volumes promise well for the value of the unique departure in scientific literature of the Collections de Suggestions Scientifiques.
L.