IN the articles on this subject the writer proposes to furnish to any earnest student the opportunity to acquire, so far as books will teach, the knowledge necessary to erect safely any building. While, of course, the work will be based strictly on the science of mechanics, all useless theory will be avoided. The object will be to make the articles simply practical. To follow any of the mathematical demonstrations, arithmetic and a rudimentary knowledge of algebra and plane geometry will be sufficient.

The following outline will probably give a better idea of the work proposed: First will come an introductory chapter on the "Strength of Materials." This chapter will give the values of, and explain briefly, the different terms used, such as strain, stress, factor-of-safety, centre of gravity, neutral axis, moment of inertia, centre and radius of gyration, moment of resistance, and moduli of elasticity and rupture.

Then will follow the several formula? to be used, with explanations giving their applications, viz.: compression in long and short columns; wrinkling strains and lateral flexure in top chords of girders and beams; tension and shearing strains'; transverse strains, including rupture, deflection and bending moments in cantilevers and beams; parallelogram of forces and graphical method of calculating trusses and arches; also manner of obtaining amounts of loads. Accompanying the above will be the necessary tables used in calculations.

After this introductory chapter will follow a series of chapters, each dealing with some part of a building, giving practical advice and numerous examples of calculations of strength; for instance, chapters on foundations, walls and piers, columns, beams, rivited and other girders, cast-iron lintels, roof and other trusses, spires; masonry, inverted and floor arches, corrugated iron, stairs, sidewalks, chimneys, etc., and possibly also chapters on drainage, plumbing, heating and ventilating.