HARRY and JAY. Two exchange notices from one person are allowed in each volume, thus giving all our readers an equal chance.--HENRY M.S. Your query was answered in No. 51, Vol. 12, in its regular turn.--F.H.G. Addresses of any description are never given in this department. --BILLY. Commodore George Dewey is Chief of the Bureau of Equipment and Recruiting, Navy Department. Washington, D.C.--INQUIS I. TIVE "Electro-Motors and How to Make Them," No. 3. Vol. 12.--W.R. No premium.--STUDENT. The book may be procured from a local dealer.--H.G.B. It is supposed to be a reliable institution.--CHAS. McG 1. The course pointed out is the only one to pursue. If you allow a false modesty to deter you, nothing remains to be done but suffer. 2. The exchange notice is too trivial.--WEEKLY BUYER. Stove trimmings are nickel-plated in the regular way. Read the article on electro-plating in Vol. 11, No. 23.--EDWARD B. Selling cheap jewelry and novelties on the street corners may net a living income in large cities to those who are experienced in such work, usually called "faking." It is not at all probable that it could be made a profitable calling in Texas.--X.Y.Z. Perpetual motion stands at the head of the absolute impossibilities of life; therefore, the government has never offered a prize for the solution of this mythical problem.--RANGER. Nitro-glycerine is one of the most dangerous explosives known; consequently, we cannot conscientiously describe its manufacture in this place, thus jeopardizing the lives of thoughtless persons who might attempt to make it if such a formula was furnished. --E.C.S. If in first-class condition, the three-dollar gold-piece of 1878 might be sold for $3.40. -> Several communications have been received which will be answered next week. * * * * * Not a Local Disease Because Catarrh affects your head, it is not therefore a local disease. If it did not exist in your blood, it could not manifest itself in your nose. The blood now in your brain is, before you finish reading this article, back in your heart again, and soon distributed to your liver, stomach, kidneys, and so on. Whatever impurities the blood does not carry away, cause what we call diseases. Therefore, when you have catarrh in the head, a snuff or other inhalant can at most give only temporary relief. The only way to effect a cure is to attack the disease in the blood, by taking a constitutional remedy like Hood's Sarsaparilla, which eliminates all impurities and thus permanently cures Catarrh. The success of Hood's Sarsaparilla as a remedy for Catarrh is vouched for by many people it has cured. N.B.--Be sure to get Hood's. Hood's Sarsaparilla Sold by all druggists, $1; six for $5. Prepared only by C.I. HOOD & CO., Apothecaries, Lowell, Mass 100 Doses One Dollar Sold by all druggists, $1; six for $5. Prepared only by C.I. HOOD & CO., Apothecaries, Lowell, Mass 100 Doses One Dollar * * * * *