Cotton
Cotton is now our chief vegetable fiber, the yearly crop being over six billion pounds, of which the United States raises three-fourths. Texas is the largest producer, followed by Georgia, Alabama, and Mississippi. The remainder of the world supply comes chiefly from India, Egypt, Russia, and Brazil. The Hindoos were the first ancient people to make extensive use of the cotton fiber. Not until the invention of the cotton gin by Eli Whitney in 1794 did the cotton begin to reach its present importance. Only four or five pounds of the fiber could be separated by hand from the seed by a week’s labor. The modern saw gins turn out over five thousand pounds daily.
Native Home
Cotton is the white downy covering of the seed of several special of cotton of cotton plant. It is a native of many parts of the world, being found by Columbus growing in the West Indies and on the main land, by Cortez in Mexico, and Pizarro in Peru.
Sea Island Cotton
The value of cotton depends upon the strength, and evenness of the fiber. In ordinary cotton the individual fiber is about an inch in length. The sea island cotton grown chiefly on the islands off the coast of Georgia, Carolina, and Florida is the most valuable variety, having a fine fiber, one and one-half to two inches in length. Some of the Egyptian cotton belongs to this species. Sea island cotton is used chiefly for fine laces, thread and knit goods and for the finest lawns and muslins.
Upland Cotton
The short fiber or upland cotton is the most common and useful variety. It is grown in Georgia, North and South Carolina and Alabama. Texas cotton is similar to upland, but sometimes is harsh with shorter fiber. Gulf cotton occupies a position between upland and sea island cotton.
The Brazilian and Peruvian cotton yields a long staple and is sometimes used to adulterate silk and other fibers. Some varieties of this cotton are harsh and wooly and are prized for use in mixing with wool.
Nankin Cotton
The Nankin cotton grown in China and India and in the southwestern part of Louisiana is characterized by its yellow color. It is used in weaving cloth of various kinds in the “fireside industries” which have become popular in the United States and England.
Spinning Qualities
Very fine yarn can be spun from cotton because of the spiral character of the fibers. This twist of the fibers is peculiar to cotton, being present in no other animal or vegetable fiber. On account of this twist, cotton cloths are much more elastic in character than those woven from linen, the fibers of which are stiff and straight.
After the removal of the seed, no other fiber is so free from impurities—5 per cent is the loss sustained by cleaning and bleaching. In its natural condition, cotton will not dye readily because of a waxy substance on the surface of the fibers. This must be removed by washing.
Picking and Ginning
Cotton should be picked only when it is fully ripe when the pods are fully burst and the fibers expanded. The unripe fiber is glassy, does not attain its full strength and resists the dye. After picking, the cotton is sent to the ginning factory to have the seed removed. It is then pressed into bales by hydraulic presses, five hundred pounds being the standard bale in the United States.
Physical Characteristics
Purified bleached cotton is nearly pure cellulose. It resists the action of alkalis well, but is harmed by hot, strong acids, or if acid is allowed to dry on the fabric. It is not harmed by high temperature, and so may be ironed with a hot iron.