THE author says that this work is an abridgment of his “Vocal Physiology and Hygiene,” of which a notice has already appeared in NATURE (vol. xxi. p. 271), and that it is intended “to furnish persons who make an artistic or professional use of the vocal organs with a concise account of those relations of the voice to physical and medical science which are only cursorily alluded to, or passed over altogether, in treatises on elocution and singing.”