All which perpended, it may be easily perceived with what insecurity of truth we adhere unto this opinion; ascribing not only effects depending on the natural period of time unto arbitrary calculations, and such as vary at pleasure; but confirming our tenets by the uncertain account of others and our selves. There being no positive or indisputable ground where to begin our compute; that if there were, men have been several waies mistaken; the best in some latitude, others in greater, according to the different compute of divers states, the short and irreconcilable years of some, the exceeding error in the natural frame of others, and the lapses and false deductions of ordinary accountants in most. Which duly considered, together with a strict account and critical examen of reason, will also distract the witty determinations of Astrology. That Saturn the enemy of life, comes almost every seventh year, unto the quadrate or malevolent place; that as the Moon about every seventh day arriveth unto a contrary sign, so Saturn, which remaineth about as many years, as the Moon doth daies in one sign, and holdeth the same consideration in years as the Moon in daies; doth cause these periculous periods. Which together with other Planets, and profection of the Horoscope, unto the seventh house, or opposite signs every seventh year; oppresseth living natures, and causeth observable mutations, in the state of sublunary things. Further satisfaction may yet be had from the learned discourse of _Salmasius_ lately published, [SN: _De annis Climactericis._] if any desire to be informed how different the present observations are from those of the ancients; how every one hath different Climactericals; with many other observables, impugning the present opinion. CHAPTER XIII Of the Canicular or Dog daies.