20 



0. B. B0GGILD. BOTTOM DEPOSITS. [norw. POL. EXP. 



consists of immeasurably small grains. In this case, almost the only possible 

 explanation is, that even on the sea-bottom the clay must be subjected to 

 some influence or other, in consequence of which the clay in No. 14 has 

 been firmly cemented together, while that in No. 15 has been preserved 

 almost in the condition in which it was deposited. It is not possible at present 

 to give any reason for this phenomenon, which can probably only be ex- 

 plained by a large number of observations from many different localities. 



Table of the quantity of the Particles of various Sizes in the 



Bottom- Samples. 



On looking at the above table, we are especially struck by the small 

 quantities of the coarsest particles. It has previously been stated that these 

 bottom-samples were distinguished from the great majority of others that are 

 of purely terrigenous origin, by this peculiarity, and this is all the more 

 striking when they are compared with others from the polar regions, which 

 are generally strongly characterised by containing stony particles. On the 

 average, the samples contain 0*23 per cent of particles of more than 1 mm., 

 and 1*32 per cent of particles between 0'5 and 1 mm., total 155 per cent 

 above 0*5 mm. If only the actual deep-water deposits, viz. Nos. 10 c and 

 13 — 15, be considered, the average of particles between 0'5 and 1 mm. is 

 - 06 per cent, while not one of these samples contains particles of more than 



