"This is done by means of the telephone, which transmits simultaneously several different tones through one wire by means of steel forks made to vibrate at one end of the line, the pulsations passing through the wire independently of each other, and reappearing at the distant station on vibrating reeds. "Some very interesting tests were made in the Centennial Main Building a few days ago in the presence of about fifty invited guests, among whom were noticed the Emperor and Empress of Brazil, Sir William Thompson, and quite a number of eminent electricians. "The experiments were of a very interesting and successful character. "The inventor, Mr. Gray of Chicago, asked his assistant, Mr. Goodridge, to transmit musical sounds, which were received very distinctly amid hearty applause from those present. "It was the first time that many present had heard 'Home, Sweet Home,' 'My Country, 'tis of Thee,' or 'Old Hundred,' rendered so beautifully by telegraph; and they evidently enjoyed the treat." By this invention, music played upon a piano-forte or melodeon is reproduced upon a violin attached to the receiving end of the wire at a distance of twenty-four hundred miles. Another important musical invention (English) is that of the "voice harmonium." Of this Mr. Theo. T. Seward writes,-- "To all such the invention of which I speak is a matter of deep interest, because in it is practically solved the problem of perfect intonation. It is called the 'voice harmonium,' because the securing of perfect intonation brings the tones much nearer to the quality of the human voice. The instrument has been invented and patented by Mr. Colin Brown of Glasgow, Ewing lecturer on music. By the use of additional reeds and a most ingenious keyboard, he has succeeded in giving each key in _perfect_ tune. The 'wolf' is banished altogether, without the privilege of a single growl. I do not need to say that the effect upon the ear is rich, and extremely satisfactory. After listening to it a little while, the tones of a tempered organ sound coarse and harsh. I wish very much that some of our ingenious American instrument-makers could have the opportunity of examining it. It has been publicly exhibited at the South-Kensington Exhibition, before the recent meeting of the British Association, and elsewhere. The highest scientific authorities have pronounced most thoroughly in favor of its 'perfectness, beauty, and simplicity.' Whether the greater complication of the keyboard will interfere seriously with its popular use, remains to be seen."