The perusal of Chronological Tables illustrating the history of music must appear to many readers a dry occupation. Still, it enables the lover of music to obtain in a short time a comprehensive and clear view of the gradual development of the art from the earliest period of its cultivation recorded in history to the present day. Perhaps a coloured chart contrived like the "Stream of Time," which at a glance shows the great events in universal history, might answer the purpose even better. There is no disconnection in the progress of an art, though certain occurrences may appear to the superficial observer as being entirely accidental. A musical "Stream of Time" might exhibit in various colours the natural connection between the several branches of the art of music, and their modifications conspicuous in its history. Or, this might be achieved by the representation of a tree. As in the genealogical tree which has been published of Johann Sebastian Bach the proper relation of the numerous members of his family is at once brought clearly before the eyes of the inquirer, so might the growth and spread of the different branches of the art of music be indicated, exhibiting distinctly their highest degree of culture, as well as their infancy and decay. Diagrams of this kind are, however, only suitable for a very condensed historical survey. More detailed information is better conveyed by means of chronological tables, such as Carl Czerny has compiled in his 'Umriss der ganzen Musik-Geschichte' ('A Sketch of the whole History of Music'), published at Mayence, in the year 1851. Carl Czerny, of Vienna, was a very industrious man, who, although he gave pianoforte lessons during the whole day, nevertheless found time to write above nine hundred compositions, not to mention his innumerable arrangements of operas, oratorios, symphonies, and overtures. That he could engage in such laborious research as the preparation of his chronological tables must have required is certainly surprising, especially as he was a very practical man with regard to money-making, and there is probably no musical occupation less likely to yield pecuniary advantage than is the compiling of chronological tables. It used to be said of Czerny that he was in the habit of composing while he was giving pianoforte lessons. If this is no false rumour, it perhaps accounts for the enormous number of his compositions, as well as for the slight merit of most of them. But, chronological tables he may have compiled in this way without detriment to them, since they do not require to be written with feeling, even less with inspiration, but merely with careful discernment, and with perseverance. Be this as it may, he certainly was an eminent pianoforte teacher, as is proved by his having instructed Liszt, Doehler, and other distinguished pianists. His finger-exercises, or pianoforte-studies, have outlived his other compositions, and his chronological tables will