3. _Normal day of labour._ There is a normal length of the day of labour, and it ought to be ascertained and fixed by law. Some bounds are set to it by nature. There is a minimum length, for example, beneath which it cannot fall; that minimal limit is the time required to create an equivalent to the labourer's living; but as under the capitalistic system the capitalist has also to be supported out of it, it can never be actually shortened to this minimum. There is also a maximum length above which it cannot rise, and this upper limit is fixed by two sorts of considerations, one physical, the other moral. 1st. _Physical limits._ These are set by the physical endurance of the labourer. The day of labour cannot be protracted beyond the term within which the labourer can go on from day to day in normal working condition to the end of his normal labouring career. This is always looked to with respect to a horse. He cannot be wrought more than eight hours a day regularly without injury. 2nd. _Moral limits._ The labourer needs time (which the horse does not, or he would perhaps get it) for political, intellectual, and social wants, according to the degree required by society at the time. Between the maximum and minimum limit there is, however, considerable play-room, and therefore we find labouring days prevailing of very different length, 8 hours, 10, 12, 14, 16, and even 18 hours. There is no principle in the existing industrial economy which fixes the length of the day; it must be fixed by law on a sound view of the requirements of the case. Marx pitches upon 8 hours as the best limit, because it affords a security for the permanent physical efficiency of the labourer, and gives him leisure for satisfying those intellectual and social wants which are becoming every day more largely imperative. He makes no use of the reason often urged for the 8 hours day, that the increased intelligence it would tend to cultivate in the working class would in many ways conduce to such an increase of production as would justify the shorter term of work. But he is very strong for the necessity of having it fixed by law, and points out that even then employers will need to be carefully watched or they will find ways and means of extending the day in spite of the law. When the day was fixed in England at 10 hours in some branches of industry, some masters gained an extra quarter or half-hour by taking five minutes off each meal time, and the profit made in these five minutes was often very considerable. He mentions a manufacturer who said to him, "If you allow me ten minutes extra time every day, you put £1,000 a year into my pocket," and he says that is a good demonstration of the origin of surplus value, for how much of this £1,000 would be given to the man whose extra ten minutes' labour had made it? Marx enters very fully into the history of English factory legislation, acknowledges the great benefit it has conferred both upon the labouring class and the