All the stones of a Chinese arch are commonly wedge-shaped, their sides forming radii which converge towards the centre of the curve. It is observable that, according to the opinion of Captain Parish, who surveyed and made plans of the Great Wall, no masonry could be superior to it. The arched and vaulted work was considered by him as exceedingly well turned. The Chinese, therefore, must have understood the construction and properties of the arch long before the Greeks and Romans, whose original and most ancient edifices consisted of columns, connected by straight architraves, of bulk sufficient to support the incumbent pressure of solid masonry.
SOCIABLE WEAVER-BIRD.
There are some birds whose social instinct impels them to live in company, and to unite their powers in the construction of a common edifice: in this respect resembling the Beaver among quadrupeds, and the Bee among insects. Among these we may mention the Ani (Crotophaga ani) of the West Indies; the Pensile Grosbeak (Loxia pensilis) of West Africa; and the Bottle-nested Sparrow of India: but more remarkable than any of these is the Sociable Grosbeak (Loxia socialis) of South Africa, whose habits are described by Le Vaillant.
"Figure to yourself," says this enterprising traveller, "a huge, irregular, sloping roof, with all the eaves completely covered with nests, crowded close together, and you will have a tolerably correct idea of these singular edifices." The birds commence this structure by forming the immense canopy of a mass of grass, so compact and firmly basketed together as to be impenetrable to the rain. This sometimes surrounds a large tree, giving it, but for the upper branches, somewhat the form of a mushroom. Beneath the eaves of this canopy the nests are formed; the upper surface is not used for this purpose, but as it is sloping, with a projecting rim, it serves to let the rain-water run off, and preserves each little dwelling from the wet. Le Vaillant procured one of these great shelters, and cut it in pieces with a hatchet: the chief portion consisted of Boshman's grass, so compact as to be impenetrable by rain. Each nest is three or four inches in diameter, which is sufficient for the bird; but, as they are all close together around the eaves, they appear to the eye to form but one building, and, in fact, are distinguishable from each other only by a little external aperture, which serves as an entrance to the nest. This large nest contained 320 inhabited cells.
NEST OF SOCIABLE WEAVER BIRD.
WOLVES IN ENGLAND.
King Edward the First commissioned Peter Corbet to destroy the wolves in the counties of Gloucester, Worcester, Hereford, Salop, and Stafford; and ordered John Gifford to hunt them in all the forests of England.