We can also arrive at some idea of the perfection of the senses attained by resuscitated man, by considering the accession of power which our own senses may receive by the assistance of science and art. Before the invention of the microscope, no one ever imagined that the eye could penetrate the mysteries of that world in miniature well named the _Infinitely Little_, until then absolutely unknown; no one had ever divined, for instance, that in one drop of water might be seen myriads of living beings. These beings have existed throughout all time, but man has been able to contemplate them for only two centuries. Our visual power over microscopic beings was until then unknown. The least enlightened, the most careless student of this day, regards with indifference things which Aristotle, Hippocrates, Pliny, Galienus, Albertus Magnus, and Roger Bacon could not have contemplated, or even suspected to exist. The discovery of the telescope, in the days of Kepler and Galileo, hurled back the boundaries of the human intellect and threw open to its investigation a domain hitherto sealed from its sight. There, where Hipparchus and Ptolemy had seen nothing, Galileo, Huyghens, Kepler, made, in a few nights, by the aid of the telescope, discoveries of hitherto unsuspected celestial splendour. The satellites of Jupiter and Saturn, a multitude of new stars, the phases of Venus, and, at a later period, the discovery of new planets only to be seen by the telescope, the observation of spots on the sun, and the revolution of the nebulæ into collections of stars, were the almost immediate consequences of the invention of the telescope. Thus we learned that, by the aid of art, the human eye can penetrate the most distant regions of heaven. Let us now suppose all the powers of the telescope and all those of the microscope concentrated in the sense of vision; that is to say, that in addition to all objects placed at ordinary distances, it can discern all microscopic objects, and at the same time all the celestial bodies invisible to the naked eye, and you will have an idea of what the sense of sight is, in the superhuman being.