Ab this county is fast becomiug Bn important ruanufacturing center, and but few of our readers knowing the extent, we propose to give from tiuie to time a description of the various institutions in different parts of the county, showing the extent of works, amount oí' business, etc. The following description of the extensivo busineBS of the Cornwell's and their asaociates, we take from the Detroit Tribune : The oity of Ypsilanti is fast becouiing noted as one of the largest paper producing towns in the Northwest, and, the Cornwell family are the principal owners in the milis of the Ypsilanti Paper Company, and in a uew entorprise recently devaloped at Jaokson, the manufacture of wood and atraw pulp, the company being known as the Jackson Pulp Company. Paper making has been carried on to a considerable oxtent by the Cornwelh) and their associates at Ypsilanti for a iiuniber of years, but it is only recently that their new milis have been finished and their works brought to their present pertection. They have two large papor milis near Ypsilanti, one a inile below the town, the other two miles above it. The lower mili was built in 1872, on the site of the one which was destroyed by fire a short time before, and in the destruction of which a large loss was sustained. The upper one was built in 1874, and the pulp mili was coustruoted in 187.'$, being situated just about a uiilefrom the railway station at Jackson auu 111 a nortnerly direction. The milis at Ypsilanti aro both built of stone and brick and aro bota very large and perfect struotures. The one nearest town is 314 feet long and 124 feet wide, while the other is .'H4 feet long and 140 feet wide, eaoh building being two stories in height. Both milis manufacture printing paper for the Detroit and Chicago markets chieffy. Each mili has a capacity of four tons of excellent paper per day, and together, at the present time, they are actually turning out seven tons per day as their aggregate produot, represen ting a yearly product value of f360,000. The two pieces of property near Ypsilanti are valued at $175,000, at tbe lowost figure. The lower mili oontains six grinding engines and three paper machines, two of which are constantly run on roll paper for the Chicago market. This mili was formerly owned altogether by Cornwell & Co., who were also largely interested in the upper mili. On January lst the two estublishments were Consolidated under the control of the Ypsilanti Paper CoinPan7- Xne upper mili contama tnree paper machines, five grinding engines and a Jordán engine. The two milis contain six rotary boilers for cooking stock, and are supplied with all the iacilities for doiug business that could be furnished by long experience and abundaut capital. Both milis have water powers, and the upper mili never requires any other, as the water power is abundant for all their necessities. Formerly a little village called Lowell existed where the upper mili was afterwards built, and many years ago it formed a settlement of some note and promise, but of late years it has been overshadowed by the cities of Ypsilanti and Ann Arbor, and it is now chieñy remembered as a place of the paat. The dam there has a head of fifteen and a half feet, and furnishes a power every day in the year equal at least to that of 200 horsen. The track of the Miohigan Central Railroad runs directly past the upper mili, and freight can be reoeived and discharged with the minimum of trouble, delay and cost. The lower mili is not supplied with railway connection, however, and its oporations involve a large and costly aruount of teaming. The office of the company is located in the city of Ypsilanti, at the intersectlon of the two main streets, and is now oonnected by telegraph witb both the milis, so that operations can be directed by the manager with the utmost faoility. The oompany is officered as follows: Cornelius Cornwell, President; R. W. Hemphill, Secretary. The Cornwells also own a large paper and woolen mili at Ann Arbor, where woolen goods and wrapping paper are made. The value of this property is estimated at fully $100,000.