These stones form the general stock by and from which jewels are made. The details of the various manufacturing manipulations, the tools used, also the setting in the work, together with the important item of the screws, will form the subject of the next article on Watch and Chronometer Jewelling. Not having been able to get our engraving done in time for publication, we are compelled to reserve the remainder for the next number. Hints on Clocks and Clock-Making. NUMBER ONE. Twenty-five years of hard labor amidst the dust and din of machinery, with hands cramped, and fingers stiffened by the continual use of tools, and with a brain constantly occupied in ringing the changes upon wheels and levers in their almost infinite combinations,--it requires a degree of courage to undertake to write anything that can be dignified with the name of an “article,” although it does propose to treat upon a subject with which we are fairly familiar; but it is consoling to think that one is not expected to write for the pages of this practical journal with the same degree of elegance and polish that should grace the columns of a review or magazine; that we can appear here as plain, practical mechanics, and use good hard, round words to express our ideas, backed by an experience which should add some weight--and we welcome the appearance of the “American Horological Journal,” which is to serve a good purpose by bringing out the actual experience of men who have grown gray in the art and mystery of clock-making, and preserving, by means of the “art preservative of all arts,” their dearly bought knowledge and experience, for the benefit of those who in their turn shall follow them; and it will also benefit the people in general by giving information that will lead to the purchase of good and tasteful clocks for household use. That such a journal is needed to enlighten us, is made plain by the fact that in almost every newspaper we have a vivid account of some wonderful clock “recently invented,” which may possess some merit, but they are so grossly exaggerated by some ignorant “penny-a-liner,” that we are almost led to believe in the Irishman’s marvellous “eight-day clock, that actually ran three weeks.” Even the proverbially correct “Scientific American,” of which I am a constant reader, has in its issue of June 19th, an account in its “editorial summary” of a clock in France containing “90,000 wheels,” and perhaps the most curious part of the mechanism is that which gives “the additional day in leap-year,” etc. Now, it will require but little knowledge of clocks to tell us that one with 90,000 wheels was never made and never will be, but “the additional day in leap-year” has been given by calendar clocks in this country since the year 1853.