BOOK FIFTH.

them,—do not these, I say, serve as a sufficient refutation of those who wish to attribute to the influence of the stars that which was owing to a similarity of bodily constitution? For wherefore were they both sick of the same disease, and at the same time, and not the one after the other in the order of their birth? (for certainly they could not both be born at the same time.) Or, if the fact of their having been born at different times by no means necessarily implies that they must be sick at different times, why do they contend that the difference in the time of their births was the cause of their difference in other things? Why could they travel in foreign parts at different times, marry at different times, beget children at different times, and do many other things at different times, by reason of their having been born at different times, and yet could not, for the same reason, also be sick at different times? For if a difference in the moment of birth changed the horoscope, and occasioned dissimilarity in all other things, why has that simultaneousness which belonged to their conception remained in their attacks of sickness? Or, if the destinies of health are involved in the time of conception, but those of other things be said to be attached to the time of birth, they ought not to predict anything concerning health from examination of the constellations of birth, when the hour of conception is not also given, that its constellations may be inspected. But if they say that they predict attacks of sickness without examining the horoscope of conception, because these are indicated by the moments of birth, how could they inform either of these twins when he would be sick, from the horoscope of his birth, when the other also, who had not the same horoscope of birth, must of necessity fall sick at the same time? Again, I ask, if the distance of time between the births of twins is so great as to occasion a difference of their constellations on account of the difference of their horoscopes, and therefore of all the cardinal points to which so much influence is attributed, that even from such change there comes a difference of destiny, how is it possible that this should be so, since they cannot have been conceived at different times? Or, if two conceived at the same