This edition features • illustrations ILLUSTRATIONS.I.—Pneumatic-Organ from a MS. Psalter of Eadwine in the Library of Trinity College, Cambridge II.—Peruvian Pan's Pipes, Double Set. From a Tomb in Africa III.—Early Form of the Regals. From Lucinius' Musurgia, sen Praxis Musicæ, 1536 IV.—From Gori's Thesaurus Diptychorum. Said to be from an Ancient MS. of the Time of Charlemagne V.—A Positive Organ. From Ambrosius Wilphlingseder's Erotemata, Musices Praticae, Nuremberg, 1563 VI.—A Curious Engraving showing an Organist Performing upon an Instrument with Broad Keys. From Franchinus Gaffurius' Theorica Musica, 1492 VII.—The Ancient Mode of Organ Blowing. From Praetorius' Theatrum Instrumentorum, 1620 VIII.—Terra-Cotta Model of Hydraulic Organ. Cir. 150 a.d. Carthage Museum. From Hermann Smith's "The Making of Sound in the Organ and in the Orchestra" IX.—Rev. F. W. Galpin's Working Reproduction of the Roman Hydraulus. From Hermann Smith's "The Making of Sound in the Organ and in the Orchestra"