No Abstract Available. Permission to reprint this article, which originally appeared in Acta Odontologica Scandinavica, Vol. 9, No. 1, September, 1950, lias been granted by the editor of Acta Odontologica Scandinavica, Dr. Gote Nyquist. This journal is the only Scandanavian journal published in English. Dr. Bjork is a Research Associate in Orthodontics, Northwestern University.
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Arne Björk (1950) studied this question.