to their will, do a great injury to the celestial sphere, in whose most brilliant senate, and most splendid senate-house, as it were, they suppose that wicked deeds are decreed to be done,--such deeds as that if any terrestrial state should decree them, it would be condemned to overthrow by the decree of the whole human race. What judgment, then, is left to God concerning the deeds of men, who is Lord both of the stars and of men, when to these deeds a celestial necessity is attributed? Or, if they do not say that the stars, though they have indeed received a certain power from God, who is supreme, determine those things according to their own discretion, but simply that His commands are fulfilled by them instrumentally in the application and enforcing of such necessities, are we thus to think concerning God even what it seemed unworthy that we should think concerning the will of the stars? But, if the stars are said rather to signify these things than to effect them, so that that _position of the stars_ is, as it were, a kind of speech predicting, not causing future things,--for this has been the opinion of men of no ordinary learning,--certainly the mathematicians are not wont so to speak, saying, for example, Mars in such or such a position _signifies_ a homicide, but _makes_ a homicide. But, nevertheless, though we grant that they do not speak as they ought, and that we ought to accept as the proper form of speech that employed by the philosophers in predicting those things which they think they discover in the position of the stars, how comes it that they have never been able to assign any cause why, in the life of twins, in their actions, in the events which befall them, in their professions, arts, honours, and other things pertaining to human life, also in their very death, there is often so great a difference, that, as far as these things are concerned, many entire strangers are more like them than they are like each other, though separated at birth by the smallest interval of time, but at conception generated by the same act of copulation, and at the same moment? 2. _On the difference in the health of twins._