THE DEPOSITS OF THE SEA-BOTTOM. 



89 



partly because they cannot give much new information; as each specimen is composed of a great 

 many different ingredients that are deposited on the bottom of the sea to a certain degree indepen- 

 dent of each other, specimens with very different contents may get almost the same chemical com- 

 position, and in such a case an analysis would only be of little value, even if its results in them- 

 selves may claim a greater exactness than that of a mineralogical examination. And so I end this 

 account in the hope of not having omitted anything that might to any essential degree elucidate the 

 facts belonging to this subject. 



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