I am now trying an experiment very frequent among modern authors, which is to write upon nothing, when the subject is utterly exhausted to let the pen still move on; by some called the ghost of wit, delighting to walk after the death of its body. And to say the truth, there seems to be no part of knowledge in fewer hands than that of discerning when to have done. By the time that an author has written out a book, he and his readers are become old acquaintance, and grow very loathe to part; so that I have sometimes known it to be in writing as in visiting, where the ceremony of taking leave has employed more time than the whole conversation before. The conclusion of a treatise resembles the conclusion of human life, which has sometimes been compared to the end of a feast, where few are satisfied to depart _ut plenus vitæ conviva_. For men will sit down after the fullest meal, though it be only to dose or to sleep out the rest of the day. But in this latter I differ extremely from other writers, and shall be too proud if, by all my labours, I can have any ways contributed to the repose of mankind in times so turbulent and unquiet as these. Neither do I think such an employment so very alien from the office of a wit as some would suppose; for among a very polite nation in Greece {157} there were the same temples built and consecrated to Sleep and the Muses, between which two deities they believed the strictest friendship was established. I have one concluding favour to request of my reader, that he will not expect to be equally diverted and informed by every line or every page of this discourse, but give some allowance to the author’s spleen and short fits or intervals of dulness, as well as his own, and lay it seriously to his conscience whether, if he were walking the streets in dirty weather or a rainy day, he would allow it fair dealing in folks at their ease from a window, to criticise his gate and ridicule his dress at such a juncture.