in philosophy, a body whose parts are firmly

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(a) "I have remarked, that after a great fall of rain, the degree of heat in this water is much less; which will account for what Padre Torre says (in his book, intitled Histoire et Phenomenes du Vejune), that when he tried it in company with Monsieur de la Condamine, the degree of heat, upon Reaumur's thermometer, was 68°." firmly connected together, as not easily to give way or slip from each other; in which sense solid stands opposed to fluid.

Geometricians define a solid to be the third species of magnitude, or that which has three dimensions, viz. length, breadth, and thickness or depth.

Solids are commonly divided into regular and irregular. The regular solids are those terminated by regular and equal planes, and are only five in number, viz. the tetrahedron, which consists of four equal triangles; the cube or hexahedron, of six equal squares; the octahedron, of eight equal triangles; the dodecahedron, of twelve; and the icosahedron, of twenty equal triangles.

The irregular solids are almost infinite, comprehending all such as do not come under the definition of regular solids; as the sphere, cylinder, cone, parallelogram, prism, parallelopiped, &c.

Solids, in anatomy, are the bones, ligaments, membranes, muscles, nerves and vessels, &c.

The solid parts of the body, though equally composed of vessels, are different with regard to their consistence; some being hard and others soft. The hard, as the bones and cartilages, give firmness and attitude to the body, and sustain the other parts; the soft parts, either alone or together with the hard, serve to execute the animal functions. See Anatomy.