But have they ever considered how much of life there is which the light of day does not reveal? The plants in our gardens have their roots in the rich soil prepared for their sustenance; remove those roots, and the plants fall and die. The trees of the forest spread their branches and unfold their leaves to sun and storm, but there are other branches spread below which sometimes extend more widely than those above. Through these lower limbs, hidden from the light of the sun and sheltered from the peltings of the pitiless storm, life comes to the trunk and to the upper branches. Lay bare these lower branches, and tear them from the earth, and the tree soon withers and perishes. The grass carpets the meadow, the flowers adorn the hill-sides, wheat and corn grow in the fields, the trees spread their shading limbs and drop their fruits in their season, and without these the world would be desolate. But all have their existence underground, and they cling as tenaciously to the bosom of Mother Earth as the men who walk among or upon them cling to that mysterious element which we call life. [Sidenote: WEALTH UNDERGROUND.] A great portion of the wealth of the globe lies beneath its surface. Gold and silver form the circulating medium of all civilized and many savage people. Their possession is wealth, as the lack of them is poverty; their coming brings happiness, and their departure leaves misery. From the earth they are taken, and in their pursuit men undergo many privations and suffer many hardships. The diamond that sparkles on delicate fingers has been washed from the accumulations which many centuries had piled above it. Iron, copper, tin, and other metals are sought by the light of the miner’s lamp, far away from the rays of the sun, and sometimes in long tunnels pushed beneath the ever-restless ocean. Ages and ages ago the hand of Nature deposited beds of coal in every quarter of the globe, and to-day they afford light and heat to millions of the human race. Down, down, hundreds and thousands of feet below the surface of the earth these coal-beds are spread, sometimes over areas many miles in extent, and promising a supply of fuel for many centuries to come. Thousands of men find profitable employment in these mines; and but for their labors, those of us who live above the surface would often suffer the pangs of cold. [Sidenote: VALUE OF COAL AND IRON.]