275 
1911-12.] Report on Rock Specimens. 
cubic content may have been buried sufficiently deep to escape capture by 
the trawl, which appears to have swept the surface only and not to have 
penetrated the ooze. The trawl itself may have acted selectively and 
brought up the more exposed specimens. 
Such an explanation would further account for the thinness of the 
coating of manganese found on the exposed parts of the stones. 
I 
A B 
A B 
f % O / 2 3 4 S 6 INCHES 
' ■ i ■ i ■ i ■ i , i ■ i ■ i . i 
20 0 40 80 >20 160 MM 
Fig. 6. — Explanation as in text fig. 1. 
II. Distributed by Human Agency. 
Under this category of material distributed by human agency are 
included 157 specimens of furnace-clinker and cinders, the largest of 
which measures about 5 inches cube. There are also five fragments of 
unburnt coal, both anthracitic and bituminous, the largest being 
4x2x2 inches. 
One specimen represents the metacarpal (cannon bone) of a small ox 
(Pl. VII. fig. 1). 
Another specimen consists of three pieces of an earthenware jar with 
the willow pattern in blue. 
Considering the short time that has elapsed since steamships came into 
existence it is astonishing that such a large proportion of the dredged 
material should consist of furnace clinker, but it must be remembered that 
Station 95 is in the direct route of “Atlantic liners.” From the large 
number of specimens belonging to both categories obtained from Station 95 
it may be thought that the sea-floor is thickly strewn with such material, 
