452. One point of view, in which rapid modes of conveyance increase the power of a country, deserves attention. On the Manchester Railroad, for example, above half a million of persons travel annually; and supposing each person to save only one hour in the time of transit, between Manchester and Liverpool, a saving of five hundred thousand hours, or of fifty thousand working days, of ten hours each, is effected. Now this is equivalent to an addition to the actual power of the country of one hundred and sixty-seven men, without increasing the quantity of food consumed; and it should also be remarked, that the time of the class of men thus supplied, is far more valuable than that of mere labourers. NOTES: 1. This table is extracted and reduced from one of Ravinet, Dictionnaire Hydrographique. 2 vols. 8vo. Paris. 1824. 2. I am indebted to F. Page. Esq. of Speen, for that portion of this table which relates to the internal navigation of England. Those only who have themselves collected statistical details can be aware of the expense of time and labour, of which the few lines it contains are the result. 3. The tidal navigation includes: the Thames, from the mouth of the Medway; the Severn, from the Holmes: the Trent, from Trent Falls in the Humber; the Mersey from Runcorn Gap. Chapter 35 On the Future Prospects of Manufactures, as Connected with Science 453. In reviewing the various processes offered as illustrations of those general principles which it has been the main object of the present volume to support and establish, it is impossible not to perceive that the arts and manufactures of the country are intimately connected with the progress of the severer sciences; and that, as we advance in the career of improvement, every step requires, for its success, that this connection should be rendered more intimate. The applied sciences derive their facts from experiment; but the reasonings, on which their chief utility depends, are the province of what is called abstract science. It has been shown, that the division of labour is no less applicable to mental productions than to those in which material bodies are concerned; and it follows, that the efforts for the improvement of its manufactures which any country can make with the greatest probability of success, must arise from the combined exertions of all those most skilled in the theory, as well as in the practice of the arts; each labouring in that department for which his natural capacity and acquired habits have rendered him most fit.