At the concluding lecture of the series held at the Science Museum in connection with the recent exhibition of French scientific instruments (see Nature, March 4), Dr. L. Kowarski gave an account of “Atomic Energy Developments in France, 1946–50”. Introducing him, Sir John Cockcroft reminded the audience that Dr. Kowarski, together with Dr. H. Halban, had left France in 1940, bringing to Britain the world's largest single supply of heavy water, and that he had achieved outstanding work in the study of heavy‐water moderated reactors.

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