Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleLetters to the Editor.AuthorsPaul, LouisPublicationFamily Process, 1963, Vol 2, Issue 2, p397ISSN0014-7370Publication typeArticleDOI10.1111/j.1545-5300.1963.397_1.x