The Bank of England has indeed a mechanism that tests coins and throws out all light weights. But judgment is an instrument testing things invisible, weighing arguments and motives, testing principles and characters. And the desires, are they not like unto the richly laden argosies of commerce? And fancy, hath it not the skill of artist and architect? Imagination, working in the realm of the useful, turns iron into engines. Imagination, working in realms of the beautiful, turns pigments into pictures. Imagination, working in the realms of thought, can turn things true into sciences, and things good into ethical systems. Well did the philosopher say that the greatest star is the one standing at the little end of the telescope, the one looking, not looked at nor looked for. When some Agassiz dredging the Atlantic tells us what animals lived there a million years ago, the scientist's mind seems an abyss deeper than the sea itself; and when Tyndall, climbing to the top of the Matterhorn, reads on that rock-page all the events of the ancient world, the mountain is dwarfed to an ant hill and becomes insignificant in the presence of the mountain-minded scholar. Hunters tell us that when crossing a swamp they leap from one hummock of grass to another. But Herschel and Proctor, exploring the heavenly world, step from star to star. The husbandman, squeezing a cluster of grapes in his cup, does but interpret to us the way in which the scholar squeezes planets and suns to brim the cup of knowledge for man's thirsting soul. This vast and wondrous world without is matched by man's rich and various mind within! Well did Emerson exclaim, "Man, thou palace of sight and sound, carrying in thy senses the nights and mornings, the summers and winters; carrying in thy brain the geometry of the City of God, in thy heart all the bowers of love, and all the realms of right and wrong."