be infallible; and thirdly, that the ascension[1] of the zodiacal sign should be observed with accuracy. For from[2] [the moment] of birth[3] the ascension of the zodiacal sign rising in the heaven should be closely watched,[4] since the Chaldæans, determining [from this] the horoscope, frame the configuration of the stars in accordance with the ascension [of the sign]; and they term this—disposition, in accordance with which they devise their predictions. But neither is it possible to take the birth of persons falling under consideration, as I shall explain, nor is the horoscope infallible, nor is the rising zodiacal sign apprehended with accuracy.
How it is, then, that the system of the Chaldæans[5] is unstable, let us now declare. Having, then, previously marked it out for investigation, they draw the birth of persons falling under consideration from, unquestionably, the depositing of the seed, and [from] conception or from parturition. And if one will attempt to take [the horoscope] from conception, the accurate account of this is incomprehensible, the time [occupied] passing quickly, and naturally [so]. For we are not able to say whether conception takes place upon the transference[6] of the seed or not. For this can happen even as quick as thought, just also as leaven, when put into heated jars, immediately is reduced to a glutinous state. But conception can also [take place] after a lapse of duration. For there being an interval from the mouth of the womb to the fundament, where physicians[7] say conceptions take place, it is altogether the nature of the seed deposited to occupy some time in traversing[8] this interval. The Chaldæans, therefore, being ignorant of the quantity of duration to a nicety, never will comprehend the [moment of] conception; the seed at one time being injected straight forward, and falling at one spot
