Note 270 — VARIOUS QUESTIONS CONNECTED WITH THE FOREGOING SUBJECTS, ELUCIDATED BY PHYSIOLOGICAL RESEARCHES.

Richerand has clearly shewn that this change of voice depends upon the larynx undergoing an increase in capacity; he observes that in the male, at the time of puberty, the aperture of the glottis augments in the proportion of 5 to 10, in the course of twelve months; that its extent is in fact doubled both in length and breadth: that these changes are less strongly marked in woman, whose glottis only enlarges in the proportion of 5 to 7.—Elements of Physiology, translated from the French of A. Richerand, by Robert Kerrison, London, p. 438.