Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDr. K. H. Barnard.AuthorsGRINDLEY, JOHN R.PublicationNature, 1964, Vol 204, Issue 4959, p625ISSN0028-0836Publication typeArticleDOI10.1038/204625a0