BOILING a.
ature at which a fluid is converted into vapor, with the phenomena of ebullition. This is different for different liquids, and for the same liquid under different pressures. For water, at the level of the sea, barometer 30 in., it is 212 º Fahrenheit; for alcohol, 172.96º; for ether, 94.8º; for mercury, about 675º. The…
BORON n.
orax. It is reduced with difficulty to the free state, when it can be obtained in several different forms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tour…
BOTFLY n.
A dipterous insect of the family (Estridæ, of many different species, some of which are particularly troublesome to domestic animals, as the horse, ox, and sheep, on which they deposit their eggs. A common species is one of the botflies of the horse (Gastrophilus equi), the larvæ of which (bots) are taken into the stom…
BOX n.
A tree or shrub, flourishing in different parts of the world. The common box (Buxus sempervirens) has two varieties, one of which, the dwaft box (B.suffruticosa), is much used for borders in gardens. The wood of the tree varieties, being very hard and smooth, is extensively used in the arts, as by turners, engravers, m…