Fortunately, however, we have in South Wales, adjoining the Bristol Channel, an almost exhaustless supply of coal and ironstone, which are yet nearly unwrought. It has been stated, that this coal-field extends over about twelve hundred square miles, and that there are twenty-three beds of workable coal, the total average thickness of which is ninety-five feet, and the quantity contained in each acre is 100,000 tons, or 65,000,000 tons per square mile. If from this we deduct one half for waste and for the minor extent of the upper beds, we shall have a clear supply of coal, equal to 32,000,000 tons per square mile. Now if we admit that the five million tons of coal from the Northumberland and Durham mines is equal to nearly one-third of the total consumption of coals in England, each square mile of the Welsh coal-field would yield coal for two years' consumption; and as there are from one thousand to twelve hundred square miles in this coal-field, it would supply England with fuel for two thousand years, after all our English coal-mines are worked out. It is true, that a considerable part of the coal in South Wales is of an inferior quality, and is not at present burned for domestic use; but in proportion as coal becomes scarce, improved methods of burning it will assuredly be discovered, to prevent any sulphureous fumes from entering apartments, and also to economize the consumption of fuel in all our manufacturing processes. * * * * * SONG. (_For the Mirror._) Thou hast not seen the tear-drops fill The eyes which worship thee; The deepest curse, the darkest ill, Hovers above--around me--still There are no tears for me! Thou canst not know, why I should kneel For tears to heaven--in vain; The thousand changeless pangs we feel,-- The precious drops, perchance, might heal,-- They will not start again! Thou canst not know what hopes will spring When I can gaze on thee, Even in the cold heart withering; Oh! thou to whom that heart must cling, Art more than tears to me! THOMAS M---- S. * * * * * HINTS FOR HEALTH. ["A very old and active correspondent," _Tim Tobykin_, has furnished us with the following interesting extracts from Dr. Rennie's _Treatise on Gout and Nervous Diseases_, just published. These, however, are but a portion of our correspondent's selections; and as they are written in a popular style and appear to be equally applicable to the welfare of all classes, they will doubtless be acceptable to our readers. We are not friendly to the introduction of purely professional matters into the pages of the MIRROR, but the following extracts are so far divested of technicality as to render their utility and importance obvious to every reader.] CLIMATE, LOCALITY, AND SEASONS.