But as for appealing to natural law for that which is good for men, and to reason for the power of discerning that same good--if man cannot find truth by that method, by what method shall he find it? And thus it happened that, though these philosophers and encyclopaedists were not men of science, they were at least the heralds and the coadjutors of science. We may call them, and justly, dreamers, theorists, fanatics. But we must recollect that one thing they meant to do, and did. They recalled men to facts; they bid them ask of everything they saw--What are the facts of the case? Till we know the facts, argument is worse than useless. Now the habit of asking for the facts of the case must deliver men more or less from that evil spirit which the old Romans called "Fama;" from her whom Virgil described in the AEneid as the ugliest, the falsest, and the cruellest of monsters. From "Fama;" from rumours, hearsays, exaggerations, scandals, superstitions, public opinions--whether from the ancient public opinion that the sun went round the earth, or the equally public opinion, that those who dared to differ from public opinion were hateful to the deity, and therefore worthy of death--from all these blasts of Fame's lying trumpet they helped to deliver men; and they therefore helped to insure something like peace and personal security for those quiet, modest, and generally virtuous men, who, as students of physical science, devoted their lives, during the eighteenth century, to asking of nature--What are the facts of the case? It was no coincidence, but a connection of cause and effect, that during the century of _philosopher_ sound physical science throve, as she had never thriven before; that in zoology and botany, chemistry and medicine, geology and astronomy, man after man, both of the middle and the noble classes, laid down on more and more sound, because more and more extended foundations, that physical science which will endure as an everlasting heritage to mankind; endure, even though a second Byzantine period should reduce it to a timid and traditional pedantry, or a second irruption of barbarians sweep it away for awhile, to revive again (as classic philosophy revived in the fifteenth century) among new and more energetic races; when the kingdom of God shall have been taken away from us, and given to a nation bringing forth the fruits thereof.