The following quotation is from “The Young Conchologist,” by Miss Roberts;—our readers will do well to peruse it attentively:—“We admit that shells are beautiful, and that they are admirably adapted to the exigencies of the wearers; but how shall we account for the endless diversity of shades and colours, varying from the sober coating of the garden snail, to the delicate and glowing tints which are diffused over some of the finer species, in the infinite profusion of undulations, clouds and spots, bands and reticulated figures, with which these admirable architects enrich the walls of their beautiful receptacles. The means of producing them must be sought for in the animals themselves. Their necks are furnished with pores replete with colouring fluid, which blends insensibly with the calcareous exudation already noticed, and thus occasions that exquisite variety in their testaceous coverings, which art attempts to emulate, but can never fully equal. Thus far is the result of observation and experiment. It now remains to account for the extraordinary fact that the stony exudations of testaceous animals condense only on those parts where they are essential to their welfare. But here investigation ends—the microscope has done its office. It seems as if material nature delighted to baffle the wisdom of her sons, and to say to the proud assertors of the sufficiency of human reason for comprehending the mysteries of creation and of Providence, ‘Thus far can you go, and no farther; even in the formation of a shell, or its insignificant inhabitant, your arrogant pretensions are completely humbled.’” USES OF SHELLS.