The indications at present are that nothing of importance will be done to change for the better the existing methods of housekeeping, until housekeepers are educated in the science of household affairs. They should comprehend (1) that the atmosphere is an actual thing; that it has characteristics and properties like other actual things; that it is a necessity of life, and may be made a medium for the transmission of disease; and that it is as necessary that it should be kept clean as the floor, the table, or the furniture; (2) that food is a subject which may be studied and mastered like any other subject; that the changes it undergoes in its care and preparation are governed by fixed laws; (3) they should have a knowledge of heat in order to appreciate the effects of temperature on different food materials, to regulate the ventilation of their houses, and to control fires wisely and economically; and (4) they should have some knowledge of bacteriology, that milk and water, flesh, fruit, and vegetables may be kept, or rendered, absolutely free from disease-giving properties, and that perfect cleanliness may be exercised in preparing all materials that enter the body as nutrients. It is not the intention to imply that all micro-organisms produce injurious effects wherever they are found; on the contrary, they are as essential to man's existence as are the higher forms of life; but often they seriously, even fatally, interfere with that existence, and in order to discriminate and to combat the evil a knowledge of their ways and modes of life is essential. A Harvard professor is credited with saying that no man could be a gentleman without a knowledge of chemistry; and forthwith all the students took to chemistry, for all wanted to be gentlemen. Would that somebody would authoritatively declare that no woman could be a lady without a knowledge of the chemistry of the household--what a glorious prospect would there be opened for the future health of the nation! We read in history that after a grand medieval repast the bones and refuse of the feast were thrown under the table and left to decay. The scourges which have swept over Europe in past centuries we know, to-day, were not visitations of Providence, but were simply the result of natural causes, due to ignorance of all hygienic laws on the part of the people. Compared with the barbarians of old, in these matters, we are a civilized people; compared with the possibilities of the future, we are still little more than savages.