Cincinnati is the greatest provision market on the continent or in the world. At that place speculation has been quite rife for the past two or three years, operators obtaining a controlling interest in the stock for the purpose of putting up prices. Last year the plan did not work well, owing to various causes, one of which was the small number of works in progress, such as railroads, etc., the supply of the laborers upon such works, being the life of the provision trade. Heavy losses were sustained, but it is said that the sufferers were a different class from that regularly engaged in the trade. This season the speculative fever has again prevailed. The issue has yet to be revealed. Last year nearly 1,000 head of cattle were slaughtered here, all of which were forwarded to Lake Superior as soon as packed. The price of mess beef has ranged from $8.50 to $12.00. About the first of July prices reached their highest point. During the fall the range has been from $8.50 to $10.00. When the marshy lands, skirting our watercourses in St. Clair, Macomb, Wayne, and Monroe counties, shall have been drained, (which will, no doubt, be consummated at no distant day,) a large tract will be rendered available for grazing, which will prove equal for that purpose to any in the Union. Butter and cheese will then become a leading article in our commerce. Potatoes constitute another of our staple products, and, in seasons of scarcity elsewhere, large purchases are made for shipment, but being generally based on present demand, they can hardly be called speculative. The crop of 1857 was rather meagre, and last spring and summer prices ruled high, going up to $1.20 for a short time in June. Last year we had an abundant crop, since which, under a limited export demand, prices have ruled low. The receipts at this point, from all sources, did not vary greatly from 175,000 bushels, of which 80,500 bushels were exported, chiefly to Ohio and the upper country. It is claimed, that southern Michigan produces more fine fruit than any other locality of the same extent in the United States, if not on the globe. At the same time almost every quarter of the State is constantly improving both in quality and quantity. This fact is creditable to the sagacity of our agriculturists, for probably in nothing else can an equal amount of profit be realized with the same outlay.