The present revision of this text is the outgrowth of several years of close attention to the progress, changes and adjustments which are being made daily in this important subject of nutrition. The changes made in this revised edition are all in the line of constructive teaching. The material has been reorganized that no time may be lost in a search for the proper word to illustrate a definite point. The method of project teaching used in this edition, is not a new one, although the name may possibly be unfamiliar to some. Every good teacher recognizes the value of motivation as a means of getting an idea "across." The revision of this text was undertaken with the idea of leading the student to think for herself and to put into practice the scientific facts learned in class room and ward. The author is indebted to many of her colleagues for the encouragement and constructive criticism which enabled her to make the changes which will, it is hoped and believed, materially aid the student nurse in the study of Dietetics. She also wishes to express her appreciation for the many helpful suggestions made by her co-workers in this respect, especially to Misses L. H. Gillett and L. Willson for valuable criticism and to Miss H. Buquo for assistance in the preparation of the manuscript. F. T. P. PREFACE TO FIRST EDITION No other science has so much to do with the general welfare of mankind as the study of food and its effects in the human body. When we use the term "dietetics" as representing "the effect of the food in the human body," we do so in a very broad sense, for the subject is a big one, requiring comprehensive terms to express it.