CHAP. XXVI.
IN summer some flouds are increased, as Nilus (whereof we will render another reason,* 1.1 in a more conuenient place) Theophrastus writeth, that in Pontus there are certaine riuers that increase in the summer time, whereof he iudgeth that there are three causes; first, because at that time most of all the earth is apt to be chan∣ged into winter; next, because there are some huge showers that fall in a more remote place, whose waters streaming along by secret passages, are silently dis∣charged into the same; thirdly, if the entrie be beaten with continuall windes, and the floud be beaten, and the water mounteth backe againe, which seemeth to increase because it is not poured out into the Sea;* 1.2 the fourth reason is from the Planets, for these in some moneths vrge more then in other some, and dry vp the flouds; in other places being farther off, they draw and consume lesse, in such sort•• that that which is lessened in one season is increased in another. There are some flouds that manifestly fall into some bottomlesse pit, and so are swal∣lowed vp from our sight: some are consumed by little and little, and after some intermission return again and reassume both their name and course: the cause is manifest, there is some vacuitie vnder the earth. But all water by nature discen∣deth downeward, and is carried into a voyde place. The Riuers therefore that are receiued thither make their secret course, but as soone as any thing that is solid meeteth with them, and stayeth them, by working a passage that resisteth them, lest they renue and pursue their former course.