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 in the following collections: G. Green, ''Math. Papers (Cambridge, 1871); H. v. Helmholtz, Gesammelte Abhandlungen (Leipzig, 1882–1895); Lord Rayleigh, Scientific Papers'' (Cambridge, 1899–1903); W. J. M. Rankine, Misc. Scientific Papers (London, 1881); Sir G. G. Stokes, ''Math. and Phys. Papers'' (Cambridge, 1880–1905). Numerous references to other writers will be found in the articles by P. Forchheimer (“Hydraulik”), H. Lamb (“Schwingungen elastischer Körper, insb. Akustik”), and A. E. H. Love (“Hydrodynamik”) in various divisions of the fourth volume of the ''Encykl. d. math.'' Wiss.; and in H. Lamb’s Hydrodynamics (3rd ed., Cambridge, 1906).

 WAVELLITE, a mineral consisting of hydrated aluminium phosphate, Al3(OH)3(PO4)2+4H2O, crystallizing in the orthorhombic system. Distinct crystals are of rare occurrence, the mineral usually taking the form of hemispherical or globular aggregates with an internal radiated structure. It is translucent and varies in colour from grey or white to greenish, yellowish, &c. The hardness is 3, and the specific gravity 2·32. It was first found, at the end of the 18th century, by Dr W. Wavell near Barnstaple in Devonshire, where it lines crevices in a black slaty rock. It has also been found in Ireland (Tipperary and Cork), Arkansas, &c.

 WAVERLY, a village of Tioga county. New York, U.S.A., about 18 m. S.E. of Elmira, on the Cayuta Creek, near the Chemung and the Susquehanna rivers, which unite several miles S. of the village. Pop. (1800) 4123; (1900) 4465, of whom 295 were foreign-born; (1905) 4915; (1910) 4855. It is served by the Delaware, Lackawanna & Western, the Erie and the Lehigh Valley railways. With South Waverly (pop. in 1910 1084)—separated from Waverly only by the state line and really a part of the village—Sayre, and Athens, Pennsylvania, it is connected by electric railway and the three form practically an industrial unit. Waverly is also connected by electric line with Elmira. The village is a railway centre of some importance, distributes coal from the Wyoming Valley mines, and ships the dairy products of a large farming district and small fruits and garden products. Waverly was settled about 1804 by settlers from Connecticut and the Hudson River Valley, and was incorporated as a village in 1854.  WAVRE, a town of Belgium, in the province of Brabant, 14 m. S.E. of Brussels. Pop. (1904) 8517. It was on this place that Grouchy advanced on the day of Waterloo, gaining a useless success here over a Prussian corps while the fate of the campaign was being decided elsewhere. The Prussians erected here a fine monument by Van Oemberg in 1859.  WAX, a solid fatty substance of animal and vegetable origin, allied to the fixed oils and fats. From these it is distinguished by the fact that while oils and fats are glycerides, a true wax contains no glycerin, but is a combination of fatty acids with certain solid monatomic alcohols (see ).  WAX FIGURES. Beeswax is possessed of properties which render it a most convenient medium for preparing figures and models, either by modelling or by casting in moulds. At ordinary temperatures it can be cut and shaped with facility; it melts to a limpid fluid at a low heat; it mixes with any colouring matter, and takes surface tints well; and its texture and consistency may be modified by the addition of earthy matters and oils or fats. When molten, it takes the minutest impressions of a mould, and it sets and hardens at such a temperature that no ordinary climatic influences affect the form it assumes, even when it is cast in thin laminae. The facilities which wax offers for modelling have been taken advantage of from the remotest times. Figures in wax of their deities were used in the funeral rites of the ancient Egyptians, and deposited among other offerings in their graves; many of these are now preserved in museums. That the Egyptians also modelled fruits can be learned from numerous allusions in early literature. Among the Greeks during their best art period, wax figures were largely used as dolls for children; statuettes of deities were modelled for votive offerings and for religious ceremonies, and wax images to which magical properties were attributed were treasured by the people. Wax figures and models held a still more important place among the ancient Romans. The masks (effigies or imagines) of ancestors, modelled in wax, were preserved by

patrician families, this jus imaginum being one of the privileges of the nobles, and these masks were exposed to view on ceremonial occasions, and carried in their funeral processions. The closing days of the Saturnalia were known as Sigillaria, on account of the custom of making, towards the end of the festival, presents of wax models of fruits and waxen statuettes which were fashioned by the Sigillarii or manufacturers of small figures in wax and other media. The practice of wax modelling can be traced through the middle ages, when votive offerings of wax figures were made to churches, and the memory and lineaments of monarchs and great personages were preserved by means of wax masks as in the days of Roman patricians. In these ages malice and superstition found expression in the formation of wax images of hated persons, into the bodies of which long pins were thrust, in the confident expectation that thereby deadly injury would be induced to the person represented; and this belief and practice continued till the 17th century. Indeed the superstition still survives in the Highlands of Scotland, where as recently as 1885 a clay model of an enemy was found in a stream, having been placed there in the belief that, as the clay was washed away, so would the health of the hated one decline. With the renaissance of art in Italy, modelling in wax took a position of high importance, and it was practised by some of the greatest of the early masters. The bronze medallions of Pisano and the other famous medallists owe their value to the art qualities of wax models from which they were cast by the cire perdue process; and indeed all early bronzes and metal work were cast from wax models. The tête de cire in the Wicar collection at Lille is one of the most lovely examples of artistic work in this medium in existence. Wicar, one of Napoleon’s commissaries, brought this figure from Italy. It represents the head and shoulders of a young girl. It has been claimed as a work of Greek or Roman art, and has been assigned to Leonardo da Vinci and to Raphael, but all that can be said is that it probably dates from the Italian Renaissance. In 1909 Dr Bode, the director of the Kaiser Friedrich Museum at Berlin, purchased in England, for (it was stated) £8000, a life-sized half-length female figure in wax, which he attributed to Leonardo da Vinci or his school. The figure was shown to have once been in the possession of Richard Cockle Lucas (1800–1883), a sculptor and worker in ivory, wax, &c. It was claimed that the figure was really Lucas’s work and was a reproduction in wax of a picture of “Flora” attributed to Leonardo da Vinci, now in the possession of the Morrison family at Basildon Park, near Pangbourne; this view was repudiated by Dr Bode, but was generally accepted in England (see The Times, Oct.–Dec. 1909; and particularly the Burlington Magazine, May, June, August, 1910). Till towards the close of the 18th century modelling of medallion portraits and of relief groups, the latter frequently polychromatic, was in considerable vogue throughout Europe. About the end of the 18th century Flaxman executed in wax many portraits and other relief figures which Josiah Wedgwood translated into pottery for his jasper ware. The modelling of the soft parts of dissections, &c., for teaching illustrations of anatomy was first practised at Florence, and is now very common. Such preparations formed part of a show at Hamburg in 1721, and from that time wax-works, on a plane lower than art, have been popular attractions. These exhibitions consist principally of images of historical or notorious personages, made up of waxen masks on lay figures in which sometimes mechanism is fitted to give motion to the figure. Such an exhibition of wax-works with mechanical motions was shown in Germany early in the 18th century, and is described by Steele in the Tatler. The most famous modern wax-work exhibition is that of (q.v.) in London.  WAX-TREE,, popular names of species of Myrica, especially M. cerifera, a North American plant, the fruits of which have a waxy covering and are used as a source of vegetable wax. M. Gale is the native British (q.v.) or sweet-gale.  WAXWING, a bird first so called apparently by P. J. Selby in 1825 (Illustr. Brit. Ornithology, p. 87), having been before known<section end="Waxwing" />