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CHAPTER XXII. 



OF UNIFORMITIES OF COEXISTENCE NOT 

 DEPENDENT UPON CAUSATION. 



1. THE order of the occurrence of phenomena in 

 time, is either successive or simultaneous ; the unifor- 

 mities, therefore, which obtain in their occurrence, are 

 either uniformities of succession or of coexistence. 

 Uniformities of succession are all comprehended 

 under the law of causation and its consequences. 

 Every phenomenon has a cause, which it invariably 

 follows; and from this are derived other invariable 

 sequences among the successive stages of the same 

 effect, as well as between the effects resulting from 

 causes which invariably succeed one another. 



In the same manner with these derivative unifor- 

 mities of succession, a great variety of uniformities of 

 coexistence also take their rise. Coordinate effects 

 of the same cause naturally coexist with one another. 

 High water at any point on the earth's surface, and 

 high water at the point diametrically opposite to it, 

 are effects uniformly simultaneous, resulting from the 

 direction in which the combined attraction of the sun 

 and moon act upon the waters of the ocean. An 

 eclipse of the sun to us, and an eclipse of the earth to 

 a spectator situated in the moon, are in like manner 

 phenomena invariably coexistent ; and their coexist- 

 ence can equally be deduced from the laws of their 

 production. 



It is an obvious question, therefore, whether all the 

 uniformities of coexistence among phenomena may 

 not be accounted for in this manner. And it cannot 



