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The remaining articles are: Electrical D~sc]~arges by F. LLEWEL~Y~ JONES (50 pages). Fluctuation Theory in Physical Measurements by C.W. McCoMB~E (55 pages). Cosmology by W. H. MCCREA (43 pages). The New Unstable Cosmic-Ray Particles by G. D. ROCmS-STER & C. C. BUTLER (43 pages). Of these, the second deals with a problem that is of importance in almost any kind of experimental work, and the third will not fail to fascinate its readers.

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