2 4 THE DEPOSITS OF THE SEA-BOTTOM. 



and Iceland, and between this latter island and Greenland produce the same effect here, as the case 

 was with the coarsest size, that is to say, very great percentages, which fact then may also here be 

 taken to be caused by the submarine rocks supplying part of the material, even if a larger part than 

 before may in this case be transported from the land; nor has on the other hand the ridge southwest 

 of Iceland any influence here, the curves crossing it without any appreciable alteration. 



As to the finest particles under 0"02 ram hardly a single rule concerning their distribution can 

 be made out As has been seen before, they are on an average present in about the same amount 

 in the three species of deep-sea deposits, even if they decrease a little in the Globigerina clay. This 

 circumstance is, of course, dependent on the fact that the coarser ingredients in the specimens decrease 

 from the land outward, while, at the same time, the calcareous organisms increase, which two op- 

 posite influences upon the whole counterbalance each other. The percentage may, for the rest, be 

 rather varying in the single specimens, but, as has been said before, without any special regularity; 

 the largest amount (9139 per ct) is found in specimen 139 north of the Faroe Islands, which speci- 

 men, as before noted, is uncommonly poor in sandy particles, while the percentage of lime at the 

 same time is small; if calcareous organisms are not deposited here in essentially smaller masses than 

 at other places, an uncommonly large mass of clayey substance and fine mineral particles must be 

 deposited here, and it is not easy to see, from where these particles should originate, unless the ridge 

 should have produced at least great part of them. The smallest percentage in the deep-sea specimens 

 proper, is found in no. 143 with 1274 per ct; it is situated immediately south of the preceding one, 

 and the small amount here is of course dependent on the deposition of especially large masses of the 

 coarser particles, so that the specimen upon the whole gets a highly sandy consistency. 



