Evidence in support of this new sub‐atomic particle was first found by A. G. Ratz and W. J. Weir in the spring of 1944 at the University of Toronto (Phys. Rev.66: 366, 1944). Owing to the exigencies of wartime, work on the project was suspended for almost three years. At the present time the mass and charge, if any, of the particle have still not been ascertained with any degree of accuracy, but it is felt that the discovery is likely to prove so important, and so worthy of attention, as to warrant a review of our present knowledge of the particle, in spite of the lack of reliable quantitative measurements. The difficulties in the way of experiments with mitibules will be apparent from the discussion.

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