It is true that experience, if it is sufficiently extensive and prolonged, may lead to the formulation of a set of practical rules that will carry a housewife through the ordinary household round without discredit, but the question which we have to put to ourselves is whether, by organising and directing the experience, success may not be made certain and more instructive. In these days domestic life is more complicated than it used to be; at the same time experience is in a sense more restricted. Many of the instructive processes, practical experience in which conveyed valuable if unconscious scientific training, are now conducted on a large scale, and are outside the range of domestic duties, and the housewife has to supply, by special training in scientific principles, the judgment that in days gone by was acquired as a matter of habit. It is impossible in the short space of a single article to set out the details of a systematic course of training sufficient to fit the housewife to use her judgment wisely in circumstances which require a knowledge of the principles of the fundamental physical sciences. The most that we can attempt is to give a few examples which illustrate the application of the principles of physics and chemistry. Our purpose in doing so is to suggest illustrations which appeal to every householder, and may create a desire for fuller knowledge rather than to supply a course of instruction. What we aim at is not to provide the equipment of scientific training, but to show that the scientific habit of mind will find opportunities for useful employment in many of the most ordinary affairs of life. The problems that present themselves in the course of experience are sometimes difficult and intricate; patience and careful observation as well as knowledge are required for their solution. Sometimes this solution is beyond the immediate resources of those concerned, and it is a part of scientific training to recognise when this is the case, so that effort and money may not be wasted in endeavours which are foredoomed to failure. We may cite a case in point where an extra bell was desired in a system of electric bells in a flat at a time when electric installations in private houses were somewhat rare, and workmen with any knowledge beyond that necessary for carrying out instructions were not easily found. To the confusion of the tenant, the introduction of this extra bell caused all the bells in the flat to strike work. A mathematical lecturer living in the same building was consulted, and opined that the battery of two somewhat small-looking cells was insufficient, so he obtained and added a larger cell, but the bells were obdurate and did not resume work. A lady with knowledge of physics examined the installations and discovered that the wire connections as altered were entirely wrong and did not connect the bells to the battery. A plan of the correct connections was shown to the