The duties of the various juries who will examine and recommend the articles for which prizes are to be awarded, will require much consideration. It cannot be expected, even after long experience through several successive expositions, that it would be possible to form a jury which should satisfy every exhibitor. Much, however, may be done, even at the first, by a sincere desire to arrive at just conclusions, and by an earnest endeavour to inform the public of the principles, and to point out the observations, which have led their judgment to the decisions at which they may arrive. Each of the purely mechanical arts is allied to one or more of the sciences; almost all their various processes are amenable to, and explicable by known laws; it is possible for him who is a perfect master of his own craft, so to explain them without technical terms, and in the language of common sense, that most persons of tolerably liberal education, and possessing a fair average intellect, may not only understand the effect produced, but admire the ingenuity by which it was attained. § It is of great importance that an effort should be made to remove that veil of mystery which unfortunately, even in minds otherwise well instructed, often shrouds the principles on which perfection in manufactures, in science, and still more remarkably in the fine arts, depends. These principles nevertheless are founded immutably on the nature of the material world around us, as well as upon our own internal feelings. Those which regulate taste are as general, although its rules are not so precise, as those which relate to physics. Nor need it be dreaded that a knowledge of the _grounds_ of that admiration which works of genius ever command from cultivated minds, should diminish the pleasure derived from their contemplation. Show to the student some mechanism effecting results apparently beyond the reach of the art, and he becomes impressed with the immense distance between his own intelligence and that which contrived it. Explain to him the simple means and the beautiful combinations by which it is effected, you then raise him in his own estimation, and the studious disciple thus instructed, will ultimately arrive at the conclusion that the only distance which is really _immense_, is that existing between the perfection of the highest work of human skill and the simplest of the productions of nature.