At the time of going to press the articles and machines are not properly regulated, although this should have been done before the Fair was opened. There are so many who delay bringing their articles and machines until the Fair is opened for about a week,'that, according to the way the Fair has always been managed by the Institute, no person in New York expects to see things properly arranged until it has been open for two weeks at least. The entrance on the bridge to the Battery is lined, as usual, with " Agricultural Implements," such as plows, straw cutters, reapers, corn shelters, threshers. c. Among the plows is one made entirely of wrought-iron, by R. Pettigrew, ot New York city; it is, in every respect, the well-known " Scotch Plow," the manufacture of whteh has been transferred to our city from across the water. These are good plows, but much heavier than neat American plows. Prouty Mears, of Boston, exhibit good plows, very neat, and well made. As more agricultural implements appear to arrive daily, we must defer further remarks for another week. LEATHER.—The display of leather this year is excellent, but, considering the greatness of this manufacture in the United States, it is but small. The Waterbury Leather Manufacturing Company, Connecticut, exhibit beautiful bookbinders' fancy leather, of every color and quality. Leather will receive more of our attention. MEAT BISCUIT.—Mr. Gail Borden, Jr., ex-exhibits some of his excellent Meat Biscuit and Beef Lard. This article of tood was esteemed by a Committe at the Worlds' Fair, composed of eminent chemists, one of the greatest and most beneficial of modern inventions. It was made the special subject of a lecture, and received a counsel medal. This American article of food for travellers and sea voyagers is one of the best'discoy eries of modern times. One jiound of it contains the nutriment of 8 lbs. of beef, and it will keep sweet and good tor a long time. The beef-lard is an article as beautiful in color as our finest butter, and for many purposes is better than lard. Our housewives do not yet know its real value for the purpose of cooking. GOLD QUARTZ.—Some very beautiful spe-mens of gold quartz, from Calitornia, is exhibited in the inside of the rotunda, near the left hand entrance. How the gold and quartz came to be so intimately blended, are questions for the geologist, the great question with the miner is, how to separate them in the best and cheapest manner. There is a quartz crusher and amalgamator in the machine room; it consists of common stampers, and large inclined basins with a ball in each for reducing the quartz to powder, and amalgamating the gold with the quicksilver. The inventor is H. Berdan, of N. Y.; his card states, " this machine obviates the great difficulty heretofore experienced in reducing quartz to an impalpable powder and bringing the flour of gold in contact with the quicksilver—patent applied for. He is perhaps not aware that Mr. Cochran has obtained a patent for an improvement in ball crushers and pulverizers which accomplishes the same objects. There is another quartz crusher near this, which consists of a number of wheels revolving in a circular track ; this machine is not new in principle or action. An engraving of " Rowe's Pulverizing Ore Mill," on page 81, Vol. 3, Scientific American, represents this machine exactly. It is a simple and good machine, however, and well worthy of attention. A. B. Allen, Co., Water st., this city, were agents for Mr. Rowe the patentee. RAILROAD IMPROVEMENTS.—The show of inventions relating to railroads, is most im-posirig, numerous, and attractive, nothing like it was ever seen before. The prizes offered by Mr. Ray, has been the means of calling out this array of inventive genius. Railroad car seats are numerous, and some of them excellent and beautiful. Car ventilators a,re numerous, that of P. O'Neil, of Brooklyn, for distributing the air by mechanical pressure to each seat in a car, is an excellentinvention. Mr. Paines' car and some others are conspicuous objects. A model railroad car nade of sheet-iron by Thos. E. Warren, Esq., of Troy, is one ot the best railroad improvements on exhibition, tat as it is our intention to devote considerable^pace next week to the railroad inventions on exhibition, we will say no more on the subject at present. Owing to want of completeness in arrangement we cannot say so much about the fair as we could have wished in this number, Scientific American ; next we*ek we will make up our lee way. The Institute should enforce a rule to make every exhibitor have a written or printed description of his machine or article attached to the same; exhibitors themselves do not know how much they lose by not having such placards attached to their articles.