HOUSEHOLD CHEMISTRY AN INTRODUCTORY TEXTBOOK FOR BY JOHN FERGUSON SNELL PROFESSOR OF CHEMISTRY, MACDONALD COLLEGE MCGILL UNIVERSITY New York THE MACMILLAN COMPANY 1914 All rights reserved COPYRIGHT, 1914, BY THE MACMILLAN COMPANY. Set up and electrotyped. Published June, 1914. Reprinted Norwood Press J. S. Cushing Co. - Berwick & Smith Co. 39 Mr 15-7-9, PREFACE THE recent development of courses of instruction in Home Economics in America has created a field for textbooks prepared to meet the special needs of this new class of students. The course in chemistry presented in this book is the outcome of several years' experience with a class of students, the majority of whom have had no previous instruction in the science. The text has been written with the needs of such students primarily in mind, but the hope is entertained that, with suitable omissions, it may also be found useful in the many institutions in which the student of household chemistry approaches the subject after a preliminary training in general chemistry. The principle which has been kept constantly in mind is to introduce the applications of chemistry to household affairs as early and as often as possible and to present only such portions of the subject matter of theoretical chemistry as is essential to the comprehension of these applications. In this way the student's interest is enlisted and maintained important consideration in the teaching of an applied science. The author's thanks are due to the many friends who have taken an interest in the preparation of this volume and more particularly to Professor John Bonsall Porter of McGill University; Mr. F. O. Farey, of the Robert W. Hunt Company, Montreal; and Mr. Peter H. Walsh, Chemist of the Dominion Textile Company, Magog, Quebec, for suggestions in regard to the chapters on fuels, soaps, and textiles, respectively; to Miss Katharine A. Fisher, Head of the Household Science Department, Macdonald College, for the table of weights of one cupful of various food materials; and to Professor H. C. Sherman, of Columbia University, for numerous suggestions. V a most 275029 |