Scientific method seeks to establish relations between isolated facts or phenomena, and the relation generally takes the form of cause and effect; so that persons with a scientific training are accustomed to examine the grounds for considering this relation of cause and effect in circumstances which are selected with a view to exhibiting the reality of the relation. From that training it becomes possible for them, when confronted with circumstances presenting some difficulty, to form a better opinion as to what is the cause of the difficulty than they could if they were confronted with the same difficulty without the previous training. Any attentive observer of human nature will be struck by the fact that every person is accustomed to refer every event to some cause; if it is an illness, the occasion for contracting the illness is defined; if it is any unforeseen event in the domestic economy, a reason is nearly always forthcoming; the question which the housewife is called upon to decide is whether the reason offered is a real and sufficient one. Meteorologists tell a familiar story of an Indian nabob who found that there was a deposit of moisture on the outside of his tumbler of brandy and water, and tasting it with his finger, remarked it was very curious that the water came through the glass but the brandy did not. Plenty of reasons offered for domestic incidents have no better ground of fact than the nabob's opinion that the water came through the glass. A good deal of the comfort of a modern house turns upon a right judgment as regards cause and effect, and therefore some preparation which will fit the housewife to appreciate the rights and wrongs of domestic reasoning is an indispensable qualification for success. It is not always possible for the most profound student to offer offhand the true explanation of various facts of domestic life, but it is possible to approach the consideration of these questions with some hope of deciding whether the explanation offered is a true or a fictitious one. The ability for this is largely a question of habit of mind or training; and for our purpose the training must include those departments of knowledge, the laws of which find daily expression in the manifold experiences of domestic life. The ultimate foundation for these laws is to be found in the study of Physics, which deals with those changes in the state of matter which stop short of the alteration of its composition; of Chemistry, which deals with changes involving an alteration of the composition of the substances under consideration; and of Physiology, which is the identification of the processes which take place in living animals and plants and their relation to the laws of physics and chemistry. Without a knowledge of the fundamental principles of these sciences and of the methods by which those principles are established, it is not to be expected that any person can deal adequately with the common experiences of life.