Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleProf. D. B. Blacklock, C.M.G.AuthorsGORDON, R. M.PublicationNature, 1955, Vol 176, Issue 4472, p97ISSN0028-0836Publication typeArticleDOI10.1038/176097b0