Among other improvements which mark the character of the present age is the attention besto wed by men of sense and education on the highly useful and liberal policy of providing popular exhibitions, illustrating in themselves the progress, and in many cases the history of the several branches of sciences and the mechanic and more polite arts. Such exhibitions not only afford satisfaction to every lover of his country, and every friend to the welfare and prosperity of mankind, but impart to the thousands who visit them the most impressive, useful, and comprehensive lesson,s in the history of invention and the arts, and their application to the various branches of industry and every-day life. In viewing the miniature construction and operation of the most intricate piece of machinery, the untutored mind is enabled to grasp and comprehend its nature and operation, and appreciate its benefit, and the ingenuity and skill expended in its production, and to thus acquire a knowledge which it would be difficult to couyey through the more slow, tedious, and (to many) distasteful processes, laid down in books. In order that the ingenious anu useful contents of these exhibitions may be presented in the proper form and order, equally to the emolument of the learned and the less perplexing of the unskilled and more ignorant observer, we would suggest to those having them in cparge, as well as to the exhibitors, the observance of one or two rules, which will tend to destroy the prejudice existing against them, and enable them to fulfil the praiseworthy objects they are designed to accomplish. To render sucha fair or exhibition effective in the particulars we have mentioned, it is necessary that it should be what its name implies, under the superintendence of pecuniarily disinterested and impartial men, whose sale object is to benefit science and the mechanic arts and their fellow men, by displaying to the world, in the most familiar and instructive manner, the manifold results of the ingenuity and skill of the inventive mechanics and others, with which our country fortunately abounds. These men should be practical, and beyond reproach in their characters, and of such occupations aad stations as to properly represent the several classes and branches of business to which the exhibitors and the resnlts of tbeir skill and genius belong. In the selection of committees to examine, report upon, and award testimonials of superiority to meritorious inventors, skillful mechanics, and the other marked producers of articles on exhibition, a sale regard should be had to their ability and honesty to faithfully fulfil the trust reposed in them. It is too often the case that the prominent members of agricultural and mechanical fairs are not only unfitted for the responsible positions they hold, but are mainly of that class of men who assume such stations solely with a view to notoriety, and to their own emolument, or the emolument of others ; or who, being deficient in the knowledge and judgment necessary to distinguish the meritorious from the unskillful, are governed by the designing, or their personal partialities. Hence it is that the annual fairs ana other exhibitions held at different sections of the country, which, if properly carried out, would produce great good and ratiollal enjoyment, are diverted from their purposes, and made to injure, rather than encourage science and the mechanic arts. Another rule which we would commend to the attention of the superintendents and exhibitors, is that of proper taste and judgment in the method of the arrangement of the artier cles being exhibited, so as to properly display f/yk their character, and enable them to be fully understood. They should be comprised to-the in the classes to which they respec- ioHU_____ tively belong, with a distinct space between each other ; and where they are of such a nature as to prevent them being understood from the descriptive title or explanation marked on them, a person should be in attendance to describe them and their points of excellence. When a series of machines are on exhibition for performing the different operations neeessary in the fabrication or treatment of a particular alticle, they should be arranged in the proper relative positions with each other, to illustrate the various successive stages through which it passes, with samples to show the effect produced at each stage, and in this manner a full knowledge could be acquired, in a short time, of all the details of the manufacture of the most useful articles and fabrics ; as, for instance, the familiar articles of sugar and cotton, through the various operations necessary to change them from the crude state they appear in when in the forms of fresh cut sug'a{ cane and cotton bale, to the respective and" beautiful granulated and woven states necessary for consumption and wear. We trust that these few and brief suggestions' will be received in the same spirit of sincerity in which they are dictated, and that those really having the interest of the arts and sciences and their fellow men at heart, will at once set to work in the same spirit, to remove the evils attending the associations having these fairs in charge ; and by disarming suspicion inspire that confidence and attachment with which it is indispensible to the public welfare that they should be regarded.