396 THE DEEP SEA 



These examples tend to show that a better understanding of the 

 upper layers of the deep-sea bottom will be achieved only when 

 deep-sea photography or deep-sea coring is combined with a tho- 

 rough collecting of the animals — by trawling or preferably by 

 sampling the bottom with grabs. 



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Darwin, C. 1881. The Formation of Vegetable Mould through the Action 

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