"There were 2936 collieries in Britain in 1860; from these were raised 83,923,273 tons of coal. The greatly increasing consumption of coal has originated fears as to the possibility of the exhaustion of our mineral fuel. It appears that, while in 1820, only 15,000,000 tons were raised, in 1840, the amount had reached 30,000,000, and in 1860, it was nearly 84,000,000. At the same rate of increase the known coal, within a workable distance from the surface, would last at least 100 years. But the consumption, during the last twenty years of the century, would at the present increasing ratio amount to 1464 million tons a year, a quantity vastly greater than can be used. We need not, therefore, now begin to fear lest our coal-fields should be speedily used up."--_Chambers's Encyclopedia_.] "Early to bed and early to rise makes a man healthy, wealthy and wise," was a motto adopted by our forefathers when the inducements to promenade London streets by night were not so inviting as now. "Ranelagh and Vauxhall were places of frivolous amusement resorted to even by the higher classes. From those and other haunts of folly, lumbering coaches or sedan chairs conveyed home the ladies through the dimly lighted or pitch dark streets, and the gentlemen picked their way over the ruggedly-paved thoroughfares, glad of the proffered aid of the link boys who crowded round the gates of such places of public entertainment or resort as were open at night, and who, arrived at the door to which they had escorted some fashionable foot-passenger, quenched the blazing torch in the trumpet-looking ornament which one now and then still sees lingering over the entrance to some house in an antiquated square or court, a characteristic relic of London in the olden time." Street lighting was not known to the Greeks and Romans, it was therefore necessary for them whenever they went abroad after dark to carry flambeaux. Street lighting was first introduced at Paris about the beginning of the 16th century. An Edict was issued ordering the inhabitants to keep lights burning in their windows after nine at night. In 1558, lamps were exchanged for lanterns, and in 1671 these lanterns were ordered to be lighted from the 20th of October to the beginning of April. This however did not prove a satisfactory arrangement. At length a premium was offered by the Government for a dissertation on the best mode of lighting the streets. The successful competitors were a journeyman glazier, M. M. Bailly, Le Roy and Bourgeois Le Cheteaublanc. To the glazier was awarded a prize of 200 livres, and to the other three jointly 2,000 livres. The result of their suggestions was a general lighting of the streets by oil lamps set upon posts.