Had Kant had these and kindred facts before him, {195} his conception of the human mind, and consequently his ethical conception, would scarcely have been what they were. Believing, as he did, that one object of his awe—the stellar Universe—has been evolved, he might by evidence like the foregoing have been led to suspect that the other object of his awe—the human conscience—has been evolved, and has consequently a real nature unlike its apparent nature. * * * * * For the disciples of Kant living in our day there can be made no such defence as that which may be made for their master. On all sides of them lie classes of facts of various kinds, which might suffice to make them hesitate, if nothing more. Here are a few such classes of facts. Though, unlike the uncultured, who suppose everything to be what it appears, chemists had for many generations known that multitudinous substances which seem simple are really compound, and often highly compound; yet, until the time of Sir Humphrey Davy, even chemists had believed that certain substances which resisted all their powers of decomposition, were to be classed among the elements. Davy, however, by subjecting the alkalies to a force not before applied, proved that they are oxides of metals; and, suspecting the like to be the case with the earths, similarly proved the composite nature of these also. Not only the common sense of the uncultured, but the common sense of the cultured was shown to be wrong. Wider knowledge has, as usual, led to greater modesty, and, since Davy’s day, chemists have felt less certain that the so-called elements are elementary. Contrariwise, increasing evidence of sundry kinds leads them to suspect more and more strongly that they are all compound. Alike to the labourer who digs it out and to the carpenter who uses it in his workshop, a piece of chalk appears a thing than which nothing can be simpler; and ninety-nine people out of a hundred would agree with them. Yet a {196} piece of chalk is highly complex. A microscope shows it to consist of myriads of shells of _Foraminifera_; shows, further, that it contains more kinds than one; and shows, further still, that each minute shell, whole or broken, is formed of many chambers, every one of which once contained a living unit. Thus by ordinary inspection, however close, the true nature of chalk cannot be known; and to one who has absolute confidence in his eyes the assertion of its true nature appears absurd.