These processes of firing and enameling must be repeated altogether three times before the work is finished; after which the lines and divisions for the hours and minutes are marked upon the surface by a totally different process. We have here merely touched the principal points in the formation of dial-plates; the details are too complex for enumeration. If we find in such articles as these the employment of numerous chemical agencies, special tools, and peculiar manipulation, we may easily give credit to the greater wonders that remain to be developed in more costly processes; such as the composition of artificial gems, of the pastes that are made to resemble diamonds and pearls, amethysts, emeralds, and precious stones of all colors and degrees of brilliancy, beads, bulbs, striped tubes, and a hundred other fanciful toys and ornaments; the formation of lenses and eye-glasses; the coloring of glass for various purposes; and the arts of staining and painting, silvering, gilding, cutting, engraving, and etching, each of which has its own mysteries, and has been prosecuted in different ages by different means. When it is said that some of these arts are lost, the fact must be taken in a restricted sense, as merely implying that certain chemical combinations, formerly in use, are unknown to us; but the same arts are still practiced by other means. It is a peculiarity in the manufacture of glass that almost every establishment has its own receipts, and, consequently, its own secrets. Even in the materials employed in the first process of calcination--not to speak of subsequent working processes--there is an infinite diversity of choice in the ingredients, and the proportions in which they are combined; and such is the jealousy of the great manufacturers respecting these matters, that they never admit visitors into their establishments except under the seal of the strictest confidence.[16] It is not surprising, therefore, that while the elementary principles of the art have descended to us, particular combinations and processes should have died with their discoverers, or be still kept shut up in the manufactories where they are successfully practiced. [Footnote 16: To such an extent has this jealousy been carried, that many adroit expedients have been employed to mislead and baffle curiosity. Hence the infinite variety of receipts for the production of different sorts of glass that have been launched upon the public, a vast number of which have been got up expressly for the purpose of deceiving and misdirecting the inquirer. To this circumstance may be referred the remarkable contradictions and inconsistencies that may be detected in all treatises on the subject.] AN EXCELLENT MATCH; OR, THE BLESSINGS OF BAD LUCK. "It is quite impossible," said I, as I walked round the garden with my old friend, the vicar; "it is quite impossible to leave home in May; the bees will be swarming, and it is the very week of the school feast."