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 BEAUVOIR, ROGER DE, the nom de plume of (1806–1866), French writer, who was born on the 8th of November 1806 in Paris. He was the son and nephew of public officials who did not approve his literary inclinations, and it was at their request that he wrote over the signature of Roger de Beauvoir. A good-looking young fellow, of independent means, an indefatigable viveur, he astonished all Paris with his ostentatious luxury and his adventures, while his romantic novels gave him a more serious if not durable reputation. Among the best of them are L’Écolier de Cluny ou le Sophisme (1832), which is said to have furnished Alexandre Dumas and Theodore Gaillardet (1808–1882) with the idea of the Tour de Nesle, and Le Chevalier de Saint Georges (1840). He had married in 1847 an actress, Eléonore Léocadie Doze (1822–1859), from whom he obtained a judicial separation a year or two later after a long and notorious trial, following which his mother-in-law got him imprisoned for three months and fined 500 francs for a satirical poem, Mon Procès (1849). Ruined by extravagance and tied to his chair by gout, he spent the last years of his life in retirement, and died in Paris on the 27th of August 1866.

 BEAUX, CECILIA (1863–&emsp;&emsp;), American portrait-painter, was born in Philadelphia, Pennsylvania, where she became a pupil of William Sartain. But her real art training was obtained in Paris, where she started in the atelier Julian and had the coaching of painters like Robert-Fleury, Bouguereau and Dagnan Bouveret. In 1890 she exhibited at the Paris Exposition. Returning to Philadelphia, Miss Beaux obtained in 1893 the gold medal of the Philadelphia Art Club, and also the Dodge prize at the New York National Academy, and later various other distinctions. She became a member of the National Academy of Design, New York, in 1902. Among her portraits are those of Bishop-Coadjutor Greer (exhibited at the Salon in 1896); Mrs Roosevelt and her daughter; and Mrs Larz Anderson. Her “Dorothea and Francesca,” and “Ernesta and her Little Brother,” are good examples of her skill in painting children.

 BEAVER, the largest European aquatic representative of the mammalian order (q.v.), easily recognized by its large trowel-like, scaly tail, which is expanded in the horizontal direction. The true beaver (Castor fiber) is a native of Europe and northern Asia, but it is represented in North America by a closely-allied species (C. canadensis), chiefly distinguished by the form of the nasal bones of the skull. Beavers are nearly allied to the squirrels (Sciuridae), agreeing in certain structural peculiarities of the lower jaw and skull. In the Sciuridae the two main bones (tibia and fibula) of the lower half of the leg are quite separate, the tail is round and hairy, and the habits are arboreal and terrestrial. In the beavers or Castoridae these bones are in close contact at their lower ends, the tail is depressed, expanded and scaly, and the habits are aquatic. Beavers have webbed hind-feet, and the claw of the second hind-toe double. In length beavers—European and American—measure about 2 ft. exclusive of the tail, which is about 10 in. long. They are covered with a fur to which they owe their chief commercial value; this consists of two kinds of hair—the one close-set, silky and of a greyish colour, the other much coarser and longer, and of a reddish brown. Beavers are essentially aquatic in their habits, never travelling by land unless driven by necessity. Formerly common in England, the European beaver has not only been exterminated there, but likewise in most of the countries of the continent, although a few remain on the Elbe, the Rhone and in parts of Scandinavia. The American species is also greatly diminished in numbers from incessant pursuit for the sake of its valuable fur. Beavers are sociable animals, living in streams, where, so as to render the water of sufficient depth, they build dams of mud and of the stems and boughs of trees felled by their powerful incisor teeth. In the neighbourhood they make their “lodges,” which are roomy chambers, with the entrance beneath the water. The mud is plastered down by the fore-feet, and not, as often supposed, by the tail, which is employed solely as a rudder. They are mainly nocturnal, and subsist chiefly on bark and twigs or the roots of water plants. The dam differs in shape according to the nature of particular localities. Where the water has little motion it is almost straight; where the current is considerable it is curved, with its convexity towards the stream. The materials made use of are driftwood, green willows, birch and poplars; also mud and stones intermixed in such a manner as contributes to the strength of the dam, but there is no particular method observed, except that the work is carried on with a regular sweep, and that all the parts are made of equal strength. “In places,” writes Hearne, “which have been long frequented by beavers undisturbed, their dams, by frequent repairing, become a solid bank, capable of resisting a great force both of ice and water; and as the willow, poplar and birch generally take root and shoot up, they by degrees form a kind of regular planted hedge, which I have seen in some places so tall that birds have built their nests among the branches.” Their houses are formed of the same materials as the dams, with little order or regularity of structure, and seldom contain more than four old, and six or eight young beavers. It not unfrequently happens that some of the larger houses have one or more partitions, but these are only posts of the main building left by the builders to support the roof, for the apartments have usually no communication with each other except by water. The beavers carry the mud and stones with their fore-paws and the timber between their teeth. They always work in the night and with great expedition. They cover their houses late every autumn with fresh mud, which, freezing when the frost sets in, becomes almost as hard as stone, so that neither wolves nor wolverines can disturb their repose.

The favourite food of the American beaver is the water-lily (Nuphar luteum), which bears a resemblance to a cabbage-stalk, and grows at the bottom of lakes and rivers. Beavers also gnaw the bark of birch, poplar and willow trees; but during the summer a more varied herbage, with the addition of berries, is consumed. When the ice breaks up in spring they always leave their embankments, and rove about until a little before the fall of the leaf, when they return to their old habitations, and lay in their winter stock of wood. They seldom begin to repair the houses till the frost sets in, and never finish the outer coating till the cold becomes severe. When they erect a new habitation they fell the wood early in summer, but seldom begin building till towards the end of August.

The flesh of the American beaver is eaten by the Indians, and when roasted in the skin is esteemed a delicacy and is said to taste like pork. Castoreum is a substance contained in two pear-shaped pouches situated near the organs of reproduction, of a bitter taste and slightly foetid odour, at one time largely employed as a medicine, but now used only in perfumery.

Fossil remains of beavers are found in the peat and other superficial deposits of England and the continent of Europe; while in the Pleistocene formations of England and Siberia occur remains of a giant extinct beaver, Trogontherium cuvieri, representing a genus by itself.

 BEAVER (from Fr. bavière, a child’s bib, from bave, saliva), the lower part of the helmet, fixed to the neck-armour to protect the face and cheeks; properly it moved upwards, as the visor moved down, but the word is sometimes used to include the visor. The right form of the word, “baver,” has been altered from a confusion with “beaver,” a hat made of beaver-fur or a silk imitation, also, in slang, called a “castor,” from the zoological name of the beaver family.

 BEAVER DAM, a city of Dodge county, Wisconsin, U.S.A., situated in the S.E. part of the state, 63 m. N.W. of Milwaukee, on Beaver Lake, which is 9 m. long and 3 m. wide. Pop. (1890) 4222; (1900) 5128, of whom 1023 were foreign-born; (1905) 5615; (1910) 6758. Most of the population is of German