There is one more limitation to be considered--the number of occupations practised. Though man has taken out and developed all the great trades, and, indeed, all trades beyond a certain grade, he has left the roots of quite a number at home. The housewife practises the conflicting elements of many kinds of work. First, she is cook. Whatever else is done or undone, we must eat; and since eating is ordained to be done at home, that is her predominant trade. The preparation and service of food is a most useful function; and as a world-industry, in the hands of professionals, students, and experts, it has reached a comparatively high stage of development. In the nine-tenths of our homes where the housewife is cook, it comes under all these limitations: First, average capacity; second, sex-tendency; third, isolation; fourth, conflicting duties. The cook, having also the cleaning to do, the sewing, mending, nursing, and care of children, the amount of time given to cooking is perforce limited. But even the plainest of home cooking must take up a good proportion of the day. The cooking, service, and "cleaning up" of ordinary meals, in a farmhouse, with the contributory processes of picking, sorting, peeling, washing, etc., and the extra time given to special baking, pickling, and preserving, take fully six hours a day. To the man, who is out of the house during work-hours, and who seldom estimates woman's work at its real value, this may seem extreme, but the working housewife knows it is a fair allowance, even a modest one. There are degrees of speed, skill, intelligence, and purchasing power, of course; but this is a modest average; two hours for breakfast, three for dinner, one for supper. The preparation of food as a household industry takes up half the working time of half the population of the world. This utterly undeveloped industry, inadequate and exhausting, takes nearly a quarter of a twelve-hour day of the world's working force. Cooking and sewing are inimical; the sewing of the housewife is quite generally pushed over into the evening as well as afternoon, thus lengthening her day considerably. Nursing, as applied to the sick, must come in when it happens, other things giving way at that time. Cleaning is continuous. Cooking, of course, makes cleaning; the two main elements of dirt in the household being grease and ashes; another, and omnipresent one, dust. Then, there are the children to clean, and the clothes to clean--this latter so considerable an item as to take two days of extra labour--during which, of course, other departments must be less attended.