If any follow up the false reasoning which has led some to think that whatever diminishes labour diminishes the number of labourers, they might conclude, that, as there is less mental work to be done, because science has diminished the labour of that work, there would, therefore, be fewer mental workmen. Thank God, the greater facilities that have been given to the cultivation of the mind, the greater is the number of those who exert themselves in that cultivation. The effects of saving unprofitable labour are the same in all cases. The use of machinery in aid of _bodily_ labour has set that bodily labour to a thousand new employments; and has raised the character of the employments, by transferring the lowest of the drudgery to wheels and pistons. The use of science in the assistance of _mental_ labour has conducted that labour to infinitely more numerous fields of exertion; and has elevated all intellectual pursuits, by making their commoner processes the play of childhood, instead of the toil of manhood. We cannot doubt that any invention which gives assistance to the thinking powers of mankind, and, therefore, by dispensing with much mental drudgery, leads the mind forward to nobler exertions, is a benefit to all. It is not more than four hundred years ago, that the use of Arabic numerals, or figures, began to be generally known in this country. The first date in those numerals said to exist in England, is upon a brass plate in Ware church, 1454. The same date in Roman numerals, which were in use before the Arabic ones, would be expressed by eight letters, MCCCCLIV. The introduction of figures, therefore, was an immense saving of time in the commonest operations of arithmetic. How puzzled we should be, and what a quantity of labour we should lose, if we were compelled to reckon earnings and marketings by the long mode of notation, instead of the short one! This book is easily read, because it is written in words composed of twenty-four letters. In China, where there are no letters in use, every word in the language is expressed by a different character. Few people in China write or read; and those who do, acquire very little knowledge, except the mere knowledge of writing and reading. All the time of their learned men is occupied in acquiring the means of knowledge, and not knowledge itself; and the bulk of the people get very little knowledge at all. It would be just the same thing if there were no machines or engines for diminishing manual labour. Those who had any property would occupy all their time, and the time of their immediate dependents, in raising food and making clothes for themselves, and the rest of the people would go without any food or clothes at all; or rather, which comes to the same thing, there would be _no_ "rest of the people;" the lord and his vassals would have all the produce;--there would be half a million of people in the United Kingdom instead of twenty-seven millions.