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 by experiments, performed at the end of 1761. In 1764, with the aid of his assistant, William Irvine (1743–1787), he further measured the latent heat of steam, though not very accurately. This doctrine of latent heat he taught in his lectures from 1761 onwards, and in April 1762 he described his work to a literary society in Glasgow. But he never published any detailed account of it, so that others, such as J. A. Deluc, were able to claim the credit of his results. In the course of his inquiries he also noticed that different bodies in equal masses require different amounts of heat to raise them to the same temperature, and so founded the doctrine of specific heats; he also showed that equal additions or abstractions of heat produced equal variations of bulk in the liquid of his thermometers. In 1766 he succeeded Cullen in the chair of chemistry in Edinburgh, where he devoted practically all his time to the preparation of his lectures. Never very robust, his health gradually became weaker and ultimately he was reduced to the condition of a valetudinarian. In 1795 he received the aid of a coadjutor in his professorship, and two years later he lectured for the last time. He died in Edinburgh on the 6th of December 1799 (not on the 26th of November as stated in Robison’s life).

As a scientific investigator, Black was conspicuous for the carefulness of his work and his caution in drawing conclusions. Holding that chemistry had not attained the rank of a science—his lectures dealt with the “effects of heat and mixture”—he had an almost morbid horror of hasty generalization or of anything that had the pretensions of a fully fledged system. This mental attitude, combined with a certain lack of initiative and the weakness of his health, probably prevented him from doing full justice to his splendid powers of experimental research. Apart from the work already mentioned he published only two papers during his life-time—“The supposed effect of boiling on water, in disposing it to freeze more readily” (Phil. Trans., 1775), and “An analysis of the waters of the hot springs in Iceland” (Trans. Roy. Soc. Ed., 1794).

 BLACK, WILLIAM (1841–1898), British novelist, was born at Glasgow on the 9th of November 1841. His early ambition was to be a painter, but he made no way, and soon had recourse to journalism for a living. He was at first employed in newspaper offices in Glasgow, but obtained a post on the Morning Star in London, and at once proved himself a descriptive writer of exceptional vivacity. During the war between Prussia and Austria in 1866 he represented the Morning Star at the front, and was taken prisoner. This paper shortly afterwards failed, and Black joined the editorial staff of the Daily News. He also edited the Examiner, at a time when that periodical was already moribund. After his first success in fiction, he gave up journalism, and devoted himself entirely to the production of novels. For nearly thirty years he was successful in retaining the popular favour. He died at Brighton on the 10th of December 1898, without having experienced any of that reaction of the public taste which so often follows upon conspicuous successes in fiction. Black’s first novel, James Merle, published in 1864, was a complete failure; his second, Love or Marraige (1868), attracted but very slight attention. In Silk Attire (1869) and Kilmeny (1870) marked a great advance on his first work, but in 1871 A Daughter of Heth suddenly raised him to the height of popularity, and he followed up this success by a string of favourites. Among the best of his books are The Strange Adventures of a Phaeton (1872); A Princess of Thule (1874); Madcap Violet (1876); Macleod of Dare (1878); White Wings (1880); Sunrise (1880); Shandon Bells (1883); Judith Shakespeare (1884); White Heather (1885); Donald Ross of Heimra (1891); Highland Cousins (1894); and Wild Eelin (1898). Black was a thoroughgoing sportsman, particularly fond of fishing and yachting, and his best stories are those which are laid amid the breezy mountains of his native land, or upon the deck of a yacht at sea off its wild coast. His descriptions of such scenery are simple and picturesque. He was a word-painter rather than a student of human nature. His women are stronger than his men, and among them are many wayward and lovable creatures; but subtlety of intuition plays no part in his characterization. Black also contributed a life of Oliver Goldsmith to the English Men of Letters series.

 BLACK APE, a sooty, black, short-tailed, and long-faced representative of the macaques, inhabiting the island of Celebes, and generally regarded as forming a genus by itself, under the name of Cynopithecus niger, but sometimes relegated to the rank of a subgenus of Macacus. The nostrils open obliquely at some distance from the end of the snout, and the head carries a crest of long hair. There are several local races, one of which was long regarded as a separate species under the name of the Moor macaque, Macacus maurus. (See )

 BLACKBALL, a token used for voting by ballot against the election of a candidate for membership of a club or other association. Formerly white and black balls about the size of pigeons’ eggs were used respectively to represent votes for and against a candidate for such election; and although this method is now generally obsolete, the term “blackball” survives both as noun and verb. The rules of most clubs provide that a stated proportion of “blackballs” shall exclude candidates proposed for election, and the candidates so excluded are said to have been “blackballed”; but the (q.v.) is now usually conducted by a method in which the favourable and adverse votes are not distinguished by different coloured balls at all. Either voting papers are employed, or balls—of which the colour has no significance—are cast into different compartments of a ballot-box according as they are favourable or adverse to the candidate.

 BLACKBERRY, or, known botanically as Rubus fruticosus (natural order Rosaceae), a native of the north temperate region of the Old World, and abundant in the British Isles as a copse and hedge-plant. It is characterized by its prickly stem, leaves with usually three or five ovate, coarsely toothed stalked leaflets, many of which persist through the winter, white or pink flowers in terminal clusters, and black or red-purple fruits, each consisting of numerous succulent drupels crowded on a dry conical receptacle. It is a most variable plant, exhibiting many more or less distinct forms which are regarded by different authorities as sub-species or species. In America several forms of the native blackberry, Rubus nigrobaccus (formerly known as R. villosus), are widely cultivated; it is described as one of the most important and profitable of bush-fruits.

 BLACKBIRD (Turdus merula), the name commonly given to a well-known British bird of the Turdidae family, for which the ancient name was (q.v.), Anglo-Saxon ósle, equivalent of the German Amsel, a form of the word found in several old English books. The plumage of the male is of a uniform black colour, that of the female various shades of brown, while the bill of the male, especially during the breeding season, is of a bright gamboge yellow. The blackbird is of a shy and restless disposition, courting concealment, and rarely seen in flocks, or otherwise than singly or in pairs, and taking flight when startled with a sharp shrill cry. It builds its nest in March, or early in April, in thick bushes or in ivy-clad trees, and usually rears at least two broods each season. The nest is a neat structure of coarse grass and moss, mixed with earth, and plastered internally with mud, and here the female lays from four to six eggs of a blue colour speckled with brown. The blackbird feeds chiefly on fruits, worms, the larvae of insects and snails, extracting the last from their shells by dexterously chipping them on stones; and though it is generally regarded as an enemy of the garden, it is probable that the amount of damage by it to the fruit is largely compensated for by its undoubted services as a vermin-killer. The notes of the blackbird are rich and full, but monotonous as compared with those of the song-thrush. Like many other singing birds it is, in the wild state, a