Of butter, cheese, honey, (obtained without destroying the bees,) maple-sugar &c., the display was much better than we have remarked on any former occasion. And in this connection the rock salt from our own State works around Syracuse deserves honorable mention. New-York salt has been treated with systematic injustice by western consumers. In order to save a shilling or two on the barrel, they buy the inferior article produced by boiling instead of the far better obtained by solar evaporation; then they endeavor to make a New-York standard bushel of fifty six pounds do the work of a measured bushel of Turks Island weighing eighty pounds; and because the laws regulating the preservation and decomposition of animal substances will not thus be swindled, they pronounce the New-York salt impure and worthless. Now there is no purer, no better salt than the New-York solar; but, even of this, fifty-six pounds will not do the work of eighty. Buy the best quality, (and even this is dog cheap,) use the proper quantity, and no salt in the world will preserve meats better than this. The New-York solar salt exhibited at Rochester could not be surpassed, and that which had been _ground_ has no superior in its adaptation to the table. There were many tasteful Counterpanes and other products of female skill and industry exhibited, but the perpetual crowd in the 'halls' devoted to manufactures allowed no opportunity for their critical examination. Of stoves and ranges, heating and (let us be thankful for it, even at this late day) ventilating apparatus and arrangements, there was a supply; and so of daguerreotypes, trunks, harness, &c. &c. Nothing, however, arrested our attention in this hall but the specimens of FLAX-COTTON and its various proportions exhibited by E. G. Roberts, assignee of Claussen's patents for the United States. We saw one intelligent influential citizen converted from skepticism to enthusiasm for flax-cotton by his first earnest examination. It _will_ go inevitably. A cotton fibre scarcely distinguishable from Sea Island may be produced from flax by Claussen's process for six cents per pound; and a machine for breaking out the fibre from the unrotted stalk was exhibited by Mr. Clemmons of Springfield, Massachusetts, which is calculated materially to expedite the flax-cotton revolution. This machine renders the entire fibre, with hardly a loss of two per cent. as 'swingle-tow,' straight and wholly separated from the woody substance or 'shives,' at a cost which can hardly equal one cent per pound of dressed flax. Its operation is very simple, and any man who has seen it work a day may manage it. Its entire cost is from $125 to $200, according to size. It will be a shame to American agricultural enterprise if flax-cotton and linen are not both among our country's extensive and important products within the next three years.