Testing woolen cloth and silk: The great value of wool as a fibre, lies in the fact that it is strong, elastic, soft and very susceptible to dye stuffs, and being woven, furnishes a great number of air spaces, thereby rendering clothing made from it very warm and light.

Wool may be dissolved completely by a warm solution of caustic soda.

Cloth may be tested by unravelling a corner of a piece of cloth, lighting it with a match. If the flame runs along, and goes out, leaving a brown ash, and is smooth when rubbed between the thumb and finger, it contains cotton. If it burns and curls up into a ball at the end, and goes out, and the ashes black like charcoal, and is gritty when rubbed between the thumb and finger, it is a pretty sure indication, that it is all wool.

The strength of a piece of cloth, may be tested by a thread removed from the goods, by holding one end with the right hand, and the other with the left. Pull, and if it breaks off short, it is not a strong piece of goods, and would not wear well; but if it pulls out long and stringy, and upon examination one finds the fiber from one to two inches long, this may be considered a good piece of goods, and would wear well.

Silk may be tested by unravelling an end, and burning the threads. If the ash is brown and is smooth when rubbed between the thumb and finger, this would not be considered pure dye silk. If, however, when lighted, it curls up into a ball at the end, and goes out, and the ash black and when rubbed between the thumb and finger, and is gritty like charcoal, one may feel sure that it is pure dye stuff and will give excellent wear and will not crack.