THE very important letter of Dr. Aston in NATURE of December 18, 1919, gives much evidence in favour of a theory of the structure and composition of the nuclei of complex atoms as published by me five ...
I HAVE read Prof. Harkins's letter with great interest. If Prof. Harkins has succeeded in separating the isotopic hydrochloric acids he is certainly to be congratulated. The very meagre positive ...
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