It was reserved, however, for Mr. Eulenstein to acquire a musical reputation from the Jew's harp. After ten years of close application and study, this young artist has attained a perfect mastery over this untractable instrument. In giving some account of the Jew's harp, considered as a medium for musical sounds, we shall only present the result of his discoveries. This little instrument, taken singly, gives whatever grave sound you may wish to produce, as a _third_, a _fifth_, or an _octave_. If the grave tonic is not heard in the bass Jew's harp, it must be attributed, not to the defectiveness of the instrument, but to the player. In examining this result, you cannot help remarking the order and unity established by nature in harmonical bodies, which places music in the rank of exact sciences. The Jew's harp has three different tones; the bass tones of the first octave bear some resemblance to those of the flute and clarionet; those of the middle and high, to the _vox humana_ of some organs; lastly, the harmonical sounds are exactly like those of the _harmonica_. It is conceived, that this diversity of tones affords already a great variety in the execution, which is always looked upon as being feeble and trifling, on account of the smallness of the instrument. It was not thought possible to derive much pleasure from any attempt which could be made to conquer the difficulties of so limited an instrument; because, in the extent of these octaves, there were a number of spaces which could not be filled up by the talent of the player; besides, the most simple modulation became impossible. Mr. Eulenstein has remedied that inconvenience, by joining sixteen Jew's harps, which he tunes by placing smaller or greater quantities of sealing-wax at the extremity of the tongue. Each harp then sounds one of the notes of the gamut, diatonic or chromatic, and the performer can fill all the intervals, and pass all the tones, by changing the harp. That these mutations may not interrupt the measure, one harp must always be kept in advance, in the same manner as a good reader advances the eye, not upon the word which he pronounces, but upon that which follows.--_Philosophy in Sport._ * * * * * FORM OF ANCIENT BOOKS, THEIR ILLUMINATIONS, &c. The mode of compacting the sheets of their books remained the same among the Greeks during a long course of time. The sheets were folded three or four together, and separately stitched: these parcels were then connected nearly in the same mode as is at present practised. Books were covered with linen, silk, or leather.