REPORT ON THE DEEP-SEA DEPOSITS. 
189 
Residue. 
Siliceous Organisms. 
Minerals. 
Fine Washings. 
Additional Observations. 
87 ; (1 
! 
•00 %), Lituolidse, frustules of 
Diatoms. 
96 (5 ’00 %), Radiolaria, Sponge 
spicules, Astrorhizidae, Litu- 
olidse, Diatoms. 
961 
00 
5 ’00 %), Radiolaria, Sponge 
spicules, Astrorhizidse, Litu- 
olidie. Diatoms. 
5 ‘00 %), Radiolaria, Astror- 
hiza, Lituolidae, Diatoms. 
(3'00 %), m. di. 0’08 mm., angu- 
lar and rounded ; quartz, 
pumice, felspar, plagioclase, 
hornblende, augite, mag- 
netite, particles of volcanic 
rocks, a few glauconitic grains. 
(94 ’87 %), amorphous matter 
and small mineral particles. 
(20‘00 %), m. di. 0'08 mm., 
angular and rounded ; quartz, 
felspar, plagioclase, mica, 
hornblende, augite, mag- 
netite, glauconite. 
(71 ‘96 %), amorphous matter, 
with many minute mineral 
particles. 
(20'00 %), m. di. 0'08 mm., 
angular and rounded ; quartz, 
pumice, plagioclase, horn- 
blende, mica, magnetite, 
glauconite. 
(20 '00 %), m. di. 0’08 mm., 
angular and rounded ; quartz 
sometimes coated with limo- 
nite, pumice, brown glassy 
volcanic particles, mica, sani- 
dine, hornblende, augite, mag- 
netite. 
(70 '96 %), amorphous matter, 
with many minute mineral 
particles. 
(75'00 %), amorphous matter 
and many fine mineral par- 
ticles. 
The mud from the anchor in the harbour was the same 
as that described for Station 321, only somewhat darker 
in colour. 
The dredge brought up a large quantity of blue 
tenacious mud. 
The trawl brought up many dead shells of Pecten, 
&c., covered with Annelid tubes, and some sand 
formed of grains, about 1 mm. in diameter, of 
quartz, felspar, mica, hornblende, augite, and pumice. 
The trawl also brought up some sandy aggregations of 
a more or less oval shape and grey colour. These con- 
tained all the above minerals, quartz particles about 
0'5 mm. in diameter predominating. The mineral 
particles are agglutinated by a ferruginous clay. 
The sounding tube brought up over a quart (over a litre) 
of the mud. This was of a blue colour, except a thin 
watery surface layer of a red or brown colour. The 
calcareous organisms were chiefly confined to the surface 
layers. The trawl and attached tow-nets contained a 
little of the deposit, the same as the upper layers in the 
sounding tube, and in the trawl there were several 
large lumps of the stiff Blue Mud of the lower layers. 
Some of the Foraminifera are macroscopic. Some 
of the quartz grains have a diameter of 1 mm. , and 
are covered with limonite. Some of the felspar particles 
have vitreous inclusions. 
The sounding tube brought up over a litre of the mud of 
the same grey-brown colour throughout. A second 
sounding was taken and gave the same kind of deposit 
at a depth of 2840 fathoms. Some of the quartz 
particles reach a diameter of 1 mm. , and are covered 
with limonite. The trawl line parted after the trawl 
had been some time on the bottom. 
The sounding tube had sunk fifteen inches (37 '5 cm. ) into 
the bottom and brought up nearly two litres of the 
mud, of which the lower layer was reddish rather than 
grey. Tliere was also about half a litre of mud in the 
trawl and attached tow-nets. No eServescence was 
observed when the deposit was treated with acid. 
The magnetite is not always isolated, but. is often 
found inclosed in particles of volcanic rocks, or as 
inclusions in hornblende and augite. 
Falkland Islands to 
Rio de la Plata — continued. Rio de la Plata to Tristan da Cunha. 
