Authorities Consulted

The editors have freely consulted the standard technical and business literature of America and Europe in the preparation of these volumes. They desire to express their indebtedness, particularly, to the following eminent authorities, whose well-known treatises should be in the library of everyone interested in modern business methods.

Grateful acknowledgment is made also of the valuable service rendered by the many manufacturers and specialists in office and factory methods, whose coöperation has made it possible to include in these volumes suitable illustrations of the latest equipment for office use; as well as those financial, mercantile, and manufacturing concerns who have supplied illustrations of offices, factories, shops, and buildings, typical of the commercial and industrial life of America.

JOSEPH HARDCASTLE, C. P. A. Formerly Professor of Principles and Practice of Accounts, School of Commerce, Accounts, and Finance, New York University. Author of "Accounts of Executors and Testamentary Trustees." HORACE LUCIAN ARNOLD Specialist in Factory Organization and Accounting. Author of "The Complete Cost Keeper," and "Factory Manager and Accountant." JOHN F. J. MULHALL, P. A. Specialist in Corporation Accounts. Author of "Quasi Public Corporation Accounting and Management." SHERWIN CODY Advertising and Sales Specialist. Author of "How to Do Business by Letter," and "Art of Writing and Speaking the English Language." FREDERICK TIPSON, C. P. A. Author of "Theory of Accounts." CHARLES BUXTON GOING Managing Editor of The Engineering Magazine. Associate in Mechanical Engineering, Columbia University. Corresponding Member, Canadian Mining Institute. F. E. WEBNER Public Accountant. Specialist in Factory Accounting. Contributor to The Engineering Press.

GENERAL SALES OFFICES, SWIFT & CO., CHICAGO, ILL.