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sary that the nature which produces generation in 

 another thing, and also that which generates in it- 

 self, should be present with each other. And that, 

 indeed, which produces generation in another 

 thing, is the whole of the region above the moon ; 

 but the more proximate cause is the sun, who, by 

 his accessions and recessions, continually changes 

 the air, so as to cause it to be at one time cold, and 

 at another hot ; the consequence of which is, that 

 the earth is changed, and everything which the 

 earth contains. 



The obliquity of the zodiac, also, is well posited 

 with respect to the motion of the sun, for it like- 

 wise is the cause of generation. And universally 

 this is accomplished by the proper order of the 

 universe; so that one thing in it is that which 

 makes, but another that which is passive. Hence, 

 that which generates in another thing, exists above 

 the moon ; but that which generates in itself, has 

 a subsistence beneath the moon ; and that which 

 consists of both these, viz. of an ever-running 

 divine body, and of an ever-mutable generated 

 nature, is the world. 



