Let us explain those latter processes in more detail. If you dip a gold ring or a sovereign into quicksilver, it will be silvered by it, and the silvering will not come off. This union of theirs is called an amalgam. On a ring or sovereign it is mere silvering; but when the gold is in a state of powder, and the amalgamation takes place on a complete scale, it forms a white, doughy mass, in which there is included much loose quicksilver. This doughy mass is presently washed clear of all impurities, and is then squeezed in skins or cloths, through the pores of which loose quicksilver is forced, and saved for future operations. The rest of the quicksilver is burnt out. Under a moderately strong heat, quicksilver evaporates, or--to speak more scientifically--sublimes; and gold does not. The amalgam, therefore, being subjected to heat, the quicksilver escapes by sublimation, leaving the gold pure. The quicksilver escapes by sublimation; but its owner does not wish it quite to escape out of his premises, because it is an expensive article. Chambers are therefore made over the ovens, in which the mercury may once again condense, and whence it may be collected again afterward. But, with all precaution, a considerable waste always takes place. Other processes are also in use for the separation of gold from its various alloys. We have described that which is of most universal application. Let us not omit noting the significance of the fact, that a quicksilver mine exists in California. EYES MADE TO ORDER. Contradictory opinions prevail as to the limits that should be assigned to the privilege of calling Art to the aid of Nature. To some persons a wig is the type of a false and hollow age; an emblem of deceit; a device of ingenious vanity, covering the wearer with gross and unpardonable deceit. In like manner, a crusade has been waged against the skill of the dentist--against certain artificial "extents in aid" of symmetry effected by the milliner.