Hydroscopic Moisture
Wool has the remarkable property of absorbing up to 30 per cent or more of its weight of water and yet not feel perceptibly damp to the touch. This is called "hydroscopic moisture." To this property wool owes its superiority as a textile for underclothing.
WOOL SORTING
The thoroughly cleansed fiber is made up chiefly of the chemical substance keratin, being similar in composition to horn and feathers. In burning it gives off a characteristic disagreeable odor. It is a substance very weakly acid in its nature, for which reason it combines readily with many dyes. Wool resists the action of acids very well, but is much harmed by the alkalis, being dissolved completely by a warm solution of caustic soda. High temperature harms wool.
FLAX
FLAX
Next to wool and cotton, flax is used most largely in our textile manufactures. The linen fiber consists of the bast cells of certain species of flax grown in Europe, Africa, and the United States. All bast fibers are obtained near the outer surface of the plant stems. The pith and woody tissues are of no value. The flax plant is an annual and to obtain the best fibers it must be gathered before it is fully ripe. To obtain seed from which the best quality of linseed oil can be made it is usually necessary to sacrifice the quality of the fibers to some extent.