SOLIDS

geometrically, as distinguished from points, lines, and surfaces, are characterized by extension in three dimensions, and are bounded by surfaces and lines; they occupy space and are measured by volume. Physically, as distinguished from gases and liquids, they present definite shape, to the change of which they present great resistance by virtue of their hardne and elasticity. A perfect S, undergoes strain with applied stre , but resumes its original condition if the stre is removed, a bent steel spring approaches this state. The various reaction to stre is expre ed in the properties of tenacity, rigidity, ductility, malleability, and brittlene , all of which are Gependent in the cohesion of particles, and varies under the action of heat and other forces. town, Rhine land, Pru ia; cutlery. Pop. 55,000.