In the prospectus of this volume of the Scientific American, we offered four separate prizes for the' four largest lists, of subscribers.— These prizes were, 1st, “ An elegant silver pitcher.” 2nd, The Iconographic Encyclo pedia.” 3rd, “ Dempsey's Machinery of the Nineteenth Century.” 4th, “ Naval Dry Docks of the United States.” The time specified has now arrived for declaring the names of those who have gained said prizes. They are, 1st prize, John Marston, of Saratoga Springs, N. Y.; the number of names sent 125. Saratoga is an enterprizing town, but previous to this we had only three subscribers by mail in that place. 2nd prize, to L. A. Miller, Wood stock, Vt.; the number of names sent, 101. 3rd prize, to John J. Conley, of Richmond, Ind.; number of names sent, 72. 4th prize, to R. S. Titus, of Flushing, Long Island; the number of names sent 62. As we have here tofore stated, if the gentleman who has gain ed the silver pitcher prefers to have its value in money, viz., $60, we will forward the same to him,—his choice is our law. The books which have been awarded are illustrated works of a practical standard character, and are not merely useful for a single reading, but as works of reference for ever. We have no doubt but the gentlemen who . have gained them will feel satisfied. We take this opportunity of returning our sincere thanks to other competitors who have sent us lists, a number of which are nearly as large as that for the fourth prize. What ever kind turn we can do for'You, we will be happy to do it, and you may be more success ful on another occasion. It would not be just or honest if we pretend ed otherwise, than that one great object of of fering these prizes was the extension of our circulation, it was ; bl,lt at the same time, we believethe Scientific American to be a useful paper, a standard work, and will return full value to every subscriber for his money. It is not so large as some papers of the sanle price, but the value of no paper should be es timated by its size or the amount of its mere reading matter-its quality—its real worth is the only standard. We can buy forty yards- of calico at one shilling each, for one of broad cloth at five dollars, but a yard is a yard all the world over, the quality, not the quantity makes the differenee. We have the means of obtaining more varied stores of useful infor mation about science, art, and new inventions and discoveries than any other paper on our continent. We also spend more money to ob tain such information, than any other paper, and our engravings are the best illustrations of mechanical subjects ever attempted in our country. Our experience, 6ur agencies, and correspondence with qualified and able men in different parts of the Union, in France, Ger many and Britain, enable us to obtain the first and most reliable information about everything that is new in science and art. It has taken —as it always must—a number of years to dis cover, arrange, and perfect the means of ob taining such information, and now w,e rest firm - and secure oil a solid basis of a primitive for mation. We feel, and no doubt all our friends do the same, in commending the Scien tific American to persons for subscription, a consciousness of returning them a full equiva lent for the money they may subscribe. The very engravings of machinery, 'c., which we present in one volume are worth more than five dollars to any mechanic, artisan, and inventor, and we confidently aver that the same number and same amount of correct reading matter accompanying such illustrations cannot be ob tained in any paper or magazine in the world, and in no book for three times the same amount of money. It is also the only real in ventors' advocate, friend, and paper in the United States. We publish a number of va luable and rare receipts ; and communications of a most practical, scientific, and useful cha racter, by some of the ablest men in our coun try, frequently appear in our'columns. Our general subscription list has greatly in creased, and we are therefore enabled to ex pend more upon our present volume than any of the preceding seven. We return our thanks to old friends for the kind interest they have manifested in our success, and to our new friends, we say, our friendship will be much closer before the end of the present volume.