§ XLV. It can hardly be necessary to add, that, as the imitation of marbles interferes with and checks the knowledge of geography and geology, so the imitation of wood interferes with that of botany; and that our acquaintance with the nature, uses, and manner of growth of the timber trees of our own and of foreign countries, would probably, in the majority of cases, become accurate and extensive, without any labor or sacrifice of time, were not all inquiry checked, and all observation betrayed, by the wretched labors of the "Grainer." § XLVI. But this is not all. As the practice of imitation retards knowledge, so also it retards art. There is not a meaner occupation for the human mind than the imitation of the stains and striæ of marble and wood. When engaged in any easy and simple mechanical occupation, there is still some liberty for the mind to leave the literal work; and the clash of the loom or the activity of the fingers will not always prevent the thoughts from some happy expatiation in their own domains. But the grainer must think of what he is doing; and veritable attention and care, and occasionally considerable skill, are consumed in the doing of a more absolute nothing than I can name in any other department of painful idleness. I know not anything so humiliating as to see a human being, with arms and limbs complete, and apparently a head, and assuredly a soul, yet into the hands of which when you have put a brush and pallet, it cannot do anything with them but imitate a piece of wood. It cannot color, it has no ideas of color; it cannot draw, it has no ideas of form; it cannot caricature, it has no ideas of humor. It is incapable of anything beyond knots. All its achievement, the entire result of the daily application of its imagination and immortality, is to be such a piece of texture as the sun and dew are sucking up out of the muddy ground, and weaving together, far more finely, in millions of millions of growing branches, over every rood of waste woodland and shady hill.