Cook. I. A N. County Of Texas, separated from the Indian territory by Red river, and drained by Elm fork of Trinity river and its affluents; area, 900 sq. m.; pop. in 1870, 5,315, of whom 471 were colored. The E. third of the county is wooded; the rest is prairie, except along the rivers. The bottom lands of Red river are very rich. The route of the proposed Memphis, El Paso, and Pacific railroad lies through it. The chief productions in 1870 were 16,233 bushels of wheat, 211,939 of Indian corn, 51,743 of oats, 22,664 of sweet potatoes, 76,809 lbs. of butter, and 308 bales of cotton. There were 3,479 horses, 3,015 milch cows, 27,503 other cattle, 3,086 sheep, and 16,226 swine. Capital, Gainesville. II. A N. E. county of Illinois, touching Indiana and Lake Michigan; area, 1,027 sq. m.; pop. in 1870, 349,966. The surface is level or undulating, much of it being occupied by prairies. The soil is remarkably rich and deep. The fiat land was formerly thought unfit for cultivation, but is now generally esteemed the best since careful tillage has developed its richness.

It is traversed by the Illinois and Michigan canal, and by various railroads centring in Chicago. It was organized in 1831, and named after Daniel P. Cook, a member of congress from Illinois, by whose exertions a grant of 300,000 acres of land was obtained from the United States to aid in the construction of the Illinois and Michigan canal. The chief productions in 1870 were 149,200 bushels of wheat, 570,427 of Indian corn, 1,584,225 of oats, 59,973 of barley, 444,554 of potatoes, 129,210 tons of hay, 1,088,963 lbs. of butter, 57,372 of wool, 36,505 of flax, and 2,644,960 gallons of milk sold. There were 12,770 horses, 23,063 milch cows, 14,486 other cattle, 10,622 sheep, and 15,521 swine. There are a large number of manufacturing establishments, chiefly in Chicago, the county seat.