I may here observe, that carbonates work best in all moulded goods, but not otherwise, and it is necessary they should be retained therein until quite cold, or they swell out of shape; but in packing, &c., vulcanized openly, oxides should be selected, as there is little or no chemical action with sulphur or heat. I have made no mention in these papers of very finely pulverized talc, or French chalk, which, from its cheapness, if well bought, and its being unaffected by heat, and its slippery nature, is invaluable as a top dressing, well rubbed in, upon the surface of all white goods for open vulcanizing, as well as dusting the sheet zinc upon which they are laid. It is equally valuable in all goods cured in rolls, such as medical sheeting, &c., and renders entirely unnecessary the rays of the sun afterwards, needing only to be wiped off with a dry cloth after vulcanizing. * * * * * There are many most respectable manufacturers, and these should have their sense of honorable integrity acknowledged, and, as far as possible, be protected from their inferiors in morality. In writing these papers off hastily, one is really tempted to get into a violent rage with this vicious system; especially when one calls to mind that, no sooner does an ingenious man invent something really valuable and useful, but these kidnapping and adulterating traders counterfeit the same instantly, and render their make to all appearance (and to the unsuspecting) equally good, though, in reality, not so, being merely cheapened by this adulterating and tricky system. Added to which, if the originator is not very sharp in obtaining his protection for the really valuable service he has rendered to science, and to the sale of which he is looking very naturally and justly, as a remuneration of what may have probably cost the inventor many days and nights of weariness, and possibly involved the spending of his money capital, and perhaps, even besides, months of labor, disappointment, poverty, and sorrow, I say, if he is not very quick in his protection, the unblushing effrontery and impudence of these “second hand people” will rob him of the whole. I believe no pen can sufficiently protest against those individuals who thrive “and make haste to become rich” from the oozings of other men’s brains. Theirs is the basest class of felony our laws cannot reach, and, consequently, their infamous and nefarious habit continues unheeded and untouched, and often (because unknown) unscorned. This applies to caoutchouc. Special reference to particular manufactures must be discussed another day; but, if I am rightly informed, Mr. C. Goodyear especially, and others, to some extent, have suffered from these copyists very egregiously and seriously. Though my testimony would be confirmed by our best men in every branch of trade, where there is scope for genius. I must not digress, and trust you will excuse my hasty