In introducing a former edition of this work, I stated that my object and endeavour had been to produce a small book founded upon accurate scientific data - a book from which a doctor might refresh his memory, and at the same time one which he might safely place in the hands of his patients, to enlighten them on some of those important points which ought to be understood by the non-professional, and to teach them how vast and intricate is the science and art of "rational medicine."

This object and endeavour I have steadily kept in view, in preparing the present edition. To keep it "small," I have cut out all that I thought could be spared; while to maintain its character as a scientific and practical "refresher" to both doctor and patient, I have been obliged somewhat to increase the size of the volume by the following additions: -

In Chapter I. fresh matter is added under the heads "Smoking" and "Afternoon Tea."

In Chapter II (The Relationship Between Food, Heat, And Motion). I have added a new column to the Analysis Table, giving the mechanical equivalents of the British units of heat for each article analysed; also a Table of the weight and cost of various alimentary articles required to yield sufficient force to raise a certain weight to a certain height; and an epitome, by a well known writer, of the most recent views with regard to food, heat, and motion, has been added to the original matter.

In Chapter III (What Do You Need For A Normal Diet). I have added thirteen pages "On the Wholesomeness and Digestibility of various articles of food," which I hope will be of much use to those who desire to avoid dyspepsia; and a Table is given showing the percentage of water in various foods in common use; and some remarks on different modes of cooking.

In Chapter V (On The Wholesomeness And Digestibility Of Various Articles Of Food And On The Modes Of Cooking In Common Use). I have added to the article "On Getting Thin," some directions for "Getting Fat"; and I would especially call the attention of parents and of children's doctors to an article on "Fat and Starch in the nutrition of Children."

In Chapter VI (Some Principles Of Diet In Disease). I have added some remarks on "Acid, Gout, and Rheumatism from Fermented Liquors."

In Chapter VIII (Fermented Liquors). I have added new Recipes, Directions, and Appliances for the Sick-room.

In Part II., Chapter IX (Special Recipes, Directions, And Appliances For The Sick-Room)., a Table showing "the Interdependence of Winter Cough with other Diseases" has been introduced; and finally, the Index has been thoroughly revised.