My experiments were made with arghool reeds and metal pipes, copies of the originals as nearly as possible the same in bore. I obtained for the ground tone of the pipes, B in the eight foot octave; and, in this order, the tones following:— 1st pipe B———D—E—F♯—G♯. 2nd ” B—C—D—E. The pipes being cylindrical in bore with a true transport of air through them, are subject to the law displayed by the clarionet, sounding an octave lower than like length open organ pipes or lip-blown flutes. Then for harmonics I obtained the double octaves, with sometimes a slurred intervening single octave, passingly heard in the rise to the double octave. This is curious, though not unexpected when one has been accustomed to the seeming vagaries of reeds. Practically, nature does not always proceed according to academic rules. When reeds are combined with pipes, the resulting pitch is due to a compound of two forces pulling in opposite directions; the reed drawing to high pitch, and the pipe to low pitch, each acting upon the other. Some reeds will not yield to the coercive effect of the pipe more than to about the extent of a fourth, with preservation of real truth of intonation; and at such limit the reed flies back to the starting pitch and recommences, or plays false. A free reed will not bear to be drawn down by the pipe associated with it to more than an octave; and if attempt is made to cause it to respond lower in the scale (by a greater lengthening of pipe), then it makes a jump back to its original pitch. After that there are other curious relations, such as not responding beyond a fourth, and so on; particulars of which need not here be gone into. Therefore, discrepancies in experiment need not cause surprise. Simultaneously Mr. T. L. Southgate and Mr. J. D. Blaikley, attracted to the same pursuit, entered upon a course of experiment, the results of which were set forth at a meeting of the Musical Association. Mr. Blaikley is well known in connection with wind instruments, and his judgment upon musical pitch may be absolutely relied upon; and Mr. T. L. Southgate is also well known as a keen investigator in all musical matters; and as an aid to his own knowledge and skill he was fortunate in obtaining as an associate in these experimental researches, the practical experience of Mr. Finn, who, accustomed to flutes and hautboy reed instruments, could bring into use the little artifices in producing sounds from the reeds which the amateur in wind instruments lacks knowledge of. The summary of the results arrived at, shows for the 1st pipe E♭———G—A♭—B♭—C♭ 2nd ” E♭—F—G—A♭