Molesworth.—Pocket-book of useful formulæ and memoranda for civil and mechanical engineers. 781 pages, illustrated, 32mo, leather, $2.00.*

George.—Pocket-book of calculation in stresses, etc., for engineers, architects and general use. 140 pages, illustrated, 32mo., cloth, $1.40.

Sexton.—Pocket-book for boiler makers and steam users, board of trade surveyors, and the general steam-using public. 287 pages, illustrated, 32mo., leather, $2.00.

Hurst.—A hand-book of formulæ, tables and memoranda for architectural surveyors. 477 pages, illustrated, 32mo., leather, $2.00.

Jordan.—Tabulated weights of angle, tee and bulb iron and steel and other information for the use of naval architects, shipbuilders and manufacturers. 579 pages, 32mo., leather, 1896, $3.00.

Spons'.—Tables and memoranda for engineers, by Hurst. The vest pocket edition, 64mo., roan, 50c.

Mackesy.—Tables of barometrical heights to 20,000 feet, specially adapted for the use of officers on service, civil engineers and travellers. With 3 diagrams, 32mo., cloth, $1.25.

Bayley.—Pocket-book for chemists, chemical manufacturers, metallurgists, dyers, distillers, brewers, sugar refiners, photographers, students, etc., etc. 32mo., roan, $2.00. In the press.

Books mailed post paid to any address in the world on receipt of price.

Transcriber's Note: Minor punctuation, spelling and capitalisation in adverts corrected for conistency.