generations had come since then, and "other palms were won." To keep pace with the advancing science, and to maintain his station amongst his youthful competitors, would demand a youthful vigour and motives such as theirs. But, as to himself, chemistry had given all it _could_ give. Having first raised himself to distinction by that, he had since married into an ancient family--one of the leaders amongst the landed aristocracy of his own county: he had thus entitled himself to call the head of that family--a territorial potentate with ten thousand per annum--by the contemptuous sobriquet of "Dull Daniel"; he looked down upon numbers whom, twenty years before, he scarcely durst have looked up to, except perhaps as a cat is privileged to look at a king; he had obtained a bishopric. Chemistry had done all this for him; and had, besides, co-operating with luck, put him in the way of reaping a large estate from the gratitude and early death of his pupil, Mr. Luther. All this chemistry had effected. Could chemistry do anything more? Clearly not. It was a burnt-out volcano. And here it was that, having lost his motives for cultivating it farther, he regarded the present improvers of the science, not with the feelings natural to a disinterested lover of such studies on their own account, but with jealousy, as men who had eclipsed or had bedimmed his own once brilliant reputation. Two revolutions had occurred since his own "palmy days"; Sir Humphry Davy, he said, might be right; and all might be gold that glistened; but, for his part, he was too old to learn new theories--he must be content to hobble to his grave with such old-fashioned creeds as had answered in his time, when, for aught he could see, men prospered as much as in this newfangled world. Such was the tone of his ordinary talk; and, in one sense--as regards personal claims, I mean--it was illiberal enough; for the leaders of modern chemistry never overlooked _his_ claims. Professor Thomson of Glasgow always spoke of his "Essays" as of a book which hardly any revolution could antiquate; and Sir Humphry Davy, in reply to a question which I put to him upon that point in 1813, declared that he knew of no book better qualified as one of introductory discipline to the youthful experimenter, or as an apprenticeship to the taste in elegant selection of topics.