“ New Way to Make Mirrors.—The Prattsville Advocate' states that on a recent rfsit to the Rev. L. L. Hill, the alleged inventor of daguerreotypes colored by the action af light, Mr. Hill showed him a new way of making mirrors. He says: ' Mr. Hill took a I 3mall glass, such as Daguerreans us? for covering their pictures, and in forty seconds it was transformed into a perfect mirror—perfect in every respect. We kept an eye upon it the whole time ; the process was fully explained, and the result cannot be excelled. In his mode of" silvering glass," there is not a particle of the usual amalgam of tin foil and quicksilver, but it is composed wholly of pure and unadulterated silver. The discovery was made while he was experimenting on glass, with a view of adopting it to Heliochromy, never dreaming of its beautiful application to the manufacture of mirrors. The expense of manufacturing mirrors by "this new durable method, will not, we think, exceed half the cost of manufacturing the kind now used; besides, they are always perfect, and no art of man can deface them, without breaking them to pieces. We hazard nothing in predicting that it will create an entire revolution in the art of making mirrors, and that in a few years, at most, there will not be a mirror, of the kind now used, to be found in the country.— IN. Y. Tribune. It seems to us that the Rev. L. L. Hill is exceedingly fortunate in making wonderful discoveries. Here we have recorded in the " Prattsville Advocate," that the inventor of the Hillotype has made a new discovery, nothing less than silvering glass with pure silver; none of your tinfoil and quicksilver, but the real Simon pure article. We do not know how it is, but the Rev. Mr. Hill is a most lucky person to make so many discoveries. It appears to us that being a person of scientific taste, he must take the Scientific American, the real mirror of new discoveries ; the editor of the Prattsville Advocate is also familiar with our columns. We therefore recommend them to peruse page 412, Vol. 3, Scientific American, where it tells ol a method for sttferitjg gia*si%ithai] employing the old amalgams of tin foil or mercury, but using a solution of silver. We also recommend them to read page 45, Vol. 6, Scientific American, where it states that a process was invented by Mr. Thomson, whereby " he discarded all the old methods of using essential oils, &c, and coated all his surfaces, curved and flat, with pure silver." We have seen his glass in this city, and very beautiful it is. Mr. Hill may have invented a new method of silvering glass, but he is certainly not the discoverer of making mirrors by using pure silver only. It would be well for his fame to publish his method, so that he might establish his claim to originality in season. He will see by what we have said, and the references we have given, that the substitution of pure silver for the old amalgam in making mirrors is anything but new. We hope the editor of the " Prattsville Journal," has not overstated the value of Mr. Hill's discovery although he is mistaken about its age, so far as the pure silver is concerned. Inventois should be posted up in the history of inventions, and they cannot be so unless they read the Scientific American. Our editorial brethren should also be more careful to remember what they read in our columns, as we olten find them describing things as new inventions which we had noticed years ago.