To create a compeer in empire, as he did with Verus, was a dangerous innovation which could only succeed if one of the two effaced himself; and under Diocletian this very precedent caused the Roman Empire to split into halves.

We meet with this admission in the writings of almost every experienced naturalist; or, as Milne Edwards has well expressed it, "Nature is prodigal in variety, but niggard in innovation."

We can, in short, see why nature is prodigal in variety, though niggard in innovation.

By all which, instead of being discouraged, they are fifty times more violently bent upon prosecuting their schemes, driven equally on by hope and despair: that as for himself, being not of an enterprising spirit, he was content to go on in the old forms, to live in the houses his ancestors had built, and act as they did, in every part of life, without innovation: that some few other persons of quality and gentry had done the same, but were looked on with an eye of contempt and ill-will, as enemies to art, ignorant, and ill common-wealth’s men, preferring their own ease and sloth before the general improvement of their country.” His lordship added, “That he would not, by any further particulars, prevent the pleasure I should certainly take in viewing the grand academy, whither he was resolved I should go.” He only desired me to observe a ruined building, upon the side of a mountain about three miles distant, of which he gave me this account: “That he had a very convenient mill within half a mile of his house, turned by a current from a large river, and sufficient for his own family, as well as a great number of his tenants; that about seven years ago, a club of those projectors came to him with proposals to destroy this mill, and build another on the side of that mountain, on the long ridge whereof a long canal must be cut, for a repository of water, to be conveyed up by pipes and engines to supply the mill, because the wind and air upon a height agitated the water, and thereby made it fitter for motion, and because the water, descending down a declivity, would turn the mill with half the current of a river whose course is more upon a level.” He said, “that being then not very well with the court, and pressed by many of his friends, he complied with the proposal; and after employing a hundred men for two years, the work miscarried, the projectors went off, laying the blame entirely upon him, railing at him ever since, and putting others upon the same experiment, with equal assurance of success, as well as equal disappointment.” In a few days we came back to town; and his excellency, considering the bad character he had in the academy, would not go with me himself, but recommended me to a friend of his, to bear me company thither.