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 which open by a longitudinal slit on their inner side. The spores differ from those of ferns in their outer coat (exospore) being split up into four club-shaped hygroscopic threads (elaters) which are curled when moist, but become straightened when dry. In most species the fertile and sterile shoots are alike, both being green and leaf-bearing, but in a few species the fertile are more or less different, e.g. in E. arvense the fertile shoots appear first, in the spring, and are unbranched and not green. Any portion of the underground rhizome when broken off is capable of producing a new plant; hence the difficulty of eradicating them when once established. There are 24 known species of the genus which is universally distributed.  The corn horsetail E. arvense, one of the commonest species, is a troublesome weed in clayey cornfields (see fig.). The fructification appears in March and April, terminating in short unbranched stems. It is said to produce diarrhoea in such cattle as eat it. The bog horsetail, E. palustre, is said to possess similar properties. It grows in marshes, ditches, pools and drains in meadows, and sometimes obstructs the flow of water with its dense matted roots. The fructification in this species is cylindrical, and in that of E. limosum, which grows in similar situations, it is ovate in outline. The largest British species, E. maximum, grows in wet sandy declivities by railway embankments or streams, &c., and is remarkable for its beauty, due to the abundance of its elegant branches and the alternately green and white appearance of the stem. In this species the fructification is conical or lanceolate, and is found in April on short, stout, unbranched stems which have large loose sheaths. Horses appear to be fond of this species, and in Sweden it is stored for use as winter fodder. E. hyemale, commonly known as the Dutch rush, is much more abundant in Holland than in Britain; it is used for polishing purposes. E. variegatum grows on wet sandy ground, and serves by means of its fibrous roots to bind the sand together. The horsetails are remarkable for the large quantity of silica they contain in the cuticle (hence their value in polishing), which often amounts to half the weight of the ash yielded by burning them; the roots contain a quantity of starch.  HORSHAM, a market town in the Horsham parliamentary division of Sussex, England, 38 m. S. by W. from London by the London, Brighton and South Coast railway. Pop. of urban district (1901) 9446. It is pleasantly situated in the midst of a fertile country near the source of the Arun. A picturesque avenue leads to the church of St Mary, principally Early English and Perpendicular, with remains of Norman work, having a lofty tower surmounted by a spire, and containing several fine monuments, tombs and brasses. Other buildings include the grammar school, founded in 1532 and rebuilt in 1893, a town hall and corn exchange, erected in 1866 in Italian style, with an assembly room. In the vicinity are several fine mansions. The buildings of (q.v.) at West Horsham were opened in 1902, the school being removed hither from London. The town has industries of tanning, founding, carriage-building and flour-milling.

Some neolithic remains have been found at Horsham. The town is not mentioned in Domesday Book, but the Rape of Bramber, in which it lies, belonged at that time to William de Braose. His descendants held the borough and the manor of Horsham, and through them they passed to the family of Mowbray, afterwards dukes of Norfolk. There are traces of burgage tenure at Horsham in 1210, and it was called a borough in 1236. It has no charter of incorporation. Horsham sent two representatives to parliament from 1295 until 1832, when the number was reduced to one. In 1885 it was disfranchised. In 1233 Henry III. granted William de Braose a yearly three-days’ fair at his manor of Horsham. In the reign of Edward I. William de Braose claimed to have a free market on Wednesdays and Saturdays. Fairs are held on the 5th of April, 18th of July, 17th of November and 27th of November. Market days are Monday and Wednesday. “Glovers” of Horsham are mentioned in a patent roll of 1485, and a brewery existed here in the time of Queen Anne.  HORSLEY, JOHN (c. 1685–1732), British archaeologist. John Hodgson (1779–1845), the historian of Northumberland, in a short memoir published in 1831, held that he was born in 1685, at Pinkie House, in the parish of Inveresk, Midlothian, and that his father was a Northumberland Nonconformist, who had migrated to Scotland, but returned to England soon after the Revolution of 1688. J. H. Hinde, in the Archaeologia Aeliana (Feb. 1865), held that he was a native of Newcastle-on-Tyne, the son of Charles Horsley, a member of the Tailors’ Company of that town. He was educated at Newcastle, and at Edinburgh University, where he graduated M.A. on the 29th of April 1701. There is evidence that he “was settled in Morpeth as a Presbyterian minister as early as 1709.” Hodgson, however, thought that up to 1721, at which time he was residing at Widdrington, “he had not received ordination, but preached as a licentiate.” Even if he was ordained then, his stay at the latter place was probably prolonged beyond that date; for he communicated to the Philosophical Transactions (xxxii. 328) notes on the rainfall there in the years 1722 and 1723. Hinde shows that during these years “he certainly followed a secular employment as agent to the York Buildings Company, who had contracted to purchase and were then in possession of the Widdrington estates.” At Morpeth Horsley opened a private school. Respect for his character and abilities attracted pupils irrespective of religious connexion, among them Newton Ogle, afterwards dean of Westminster. He gave lectures on mechanics and hydrostatics in Morpeth, Alnwick and Newcastle, and was elected F.R.S. on the 23rd of April 1730. It is as an archaeologist that Horsley is now known. His great work, Britannia Romana, or the Roman Antiquities of Britain (London, 1732), one of the scarcest and most valuable of its class, contains the result of patient labour. There is in the British Museum a copy with notes by John Ward (c. 1679–1758), biographer of the Gresham professors. Horsley died of apoplexy on the 12th of January 1732, on the eve of the publication of the Britannia Romana. He also published two sermons and a handbook to his lectures on mechanics, &c., and projected a history of Northumberland and Durham, collections for which were found among his papers.

 HORSLEY, JOHN CALLCOTT (1817–1903), English painter, son of William Horsley, the musician, and grand-nephew of Sir Augustus Callcott, was born in London, on the 29th of January 1817. He studied painting in the Academy schools, and in 1836 exhibited “The Pride of the Village” (Vernon Gallery) at the Royal Academy. This was followed by numerous genre pictures at subsequent exhibitions up to 1893, the best known of these being “Malvolio,” “L’Allegro and il Penseroso” (painted for the Prince Consort), “Le Jour des Morts,” “A Scene from Don Quixote,” &c. In 1843 his cartoon of “St Augustine Preaching” won a prize in the Westminster Hall competition, and in 1844 he was selected as one of the six painters commissioned to execute frescoes for the Houses of Parliament, his “Religion” (1845) being put in the House of Lords; he also painted the “Henry V. assuming the Crown” and “Satan surprised at the Ear of Eve.” In 1864 he became R.A., and in 1882 was elected treasurer, a post which he held till 1897, when he resigned and became a “retired Academician.” Mr Horsley had much to do with organizing the winter exhibitions of “Old Masters” at Burlington House after 1870. When, during the ’eighties, the example of the French Salon began to affect the Academy exhibitors, and paintings of the nude became the fashion, he protested against the innovation, and his attitude caused Punch to give him the punning sobriquet of “Mr J. C(lothes) Horsley.” He died on the 18th of October 1903. His son, Sir Victor Horsley (b. 1857), became famous as a surgeon and neuropathologist, and a prominent supporter of the cause of experimental research.