Synopsis The Encyclopaedia of Solid Geometry is so presented that students will gain a knowledge of the properties of planes and lines in space; polyhedrons, cones, cylinders, and spheres; further practice in the processes of logic which were begun in plane geometry; a realization that they must understand solid geometry if they with to comprehend nature and art and the fascinating and diversified developments of modern means of communication, transportation, construction and fabrication; and skills and attitudes that will be helpful as a part of the training essential in meeting his own personal problems of everyday living.