I 
REPOET ON THE DEEP-SEA DEPOSITS. 
141 
\ 
1 Residue. 
Additional Observations. 
■ Siliceous Organisms. 
Minerals. 
1 Fine Washings. 
(5 00 %), Radiolaria, Sponge 
spicules, Astrorliizidoe, Litu- 
olid®, frustules of Diatoms. 
(20 '00 %), m. di. 0'08 mm., 
angular and rounded ; quartz, 
pumice, white mica, horn- 
blende, felspar, magnetite. 
(71 '89 %), amorphous matter, 
with many fine ■ mineral 
particles and fragments of 
siliceous organisms. 
The sounding tube had sunk 15 inches (37 '5 cm. ) into the 
bottom and brought up a quart and a half of the deposit. 
It had a red, rather than a grey, tinge, and not nearl}’' 
so dark in colour as the soundings nearer the coast. 
j(5'00 %), Radiolaria, Sponge 
‘ spicules, Astrorliizidse, Litu- 
oUd£e, Diatoms. 
] 
1 
(5'00 %), m. di. 0'06 mm., 
angular and rounded ; quartz, 
pumice, mica, hornblende, 
augite, magnetite, magnetic 
spherules. 
(90'00 %), amorphous matter, 
with a large quantity of fine 
mineral particles and frag- 
ments of siliceous organisms. 
Over a quart (over a litre) of the deposit was obtained in 
the sounding tube. The upper layers had a dark slate 
colour, while the lower had a tinge of red and were more 
compact. No effervescence was noticed when treated 
with acids, and the remains of calcareous organisms 
appear to be quite absent. 
j '5’00 %), Radiolaria, Sponge 
i spicules, one or two arena- 
ceous Foraminifera, frustules 
1 of Diatoms. 
1 
I 
(3 '00 %), m. di. O'lO mm., angu- 
lar and rounded ; quartz, mag- 
netite, pumice, basaltic scoriae, 
felspar, augite. 
(92 ’00 %), amorphous matter, 
with a large qirantity of 
minute mineral particles and 
fragments of siliceous organ- 
isms. 
The sounding tube brought up over a quart (over a litre) 
of the clay, of which the upper layers were slightly 
darker than the lower. The particles of basaltic 
scoriae attain in some cases a diameter of ] mm. 
|5'00 %), Radiolaria, Sponge 
spicules, one or two arena- 
’ ceous Foraminifera, frustules 
j of Diatoms. 
(1‘00 %), m. di. 0’07 mm., 
angular ; quartz, plagioclase, 
volcanic scoriae, magnetite, 
mica. 
(93 '30 %), amorphous matter 
with many minute mineral 
particles and fragments of 
siliceous organisms. 
The sounding tube brought up over a quart (over a litre) 
of the clay. The whole had a slightly red tinge, the 
upper layers being rather darker than the lower. A 
second sounding gave a depth of 2750 fathoms, and the 
deposit brought up was quite the same as that described. 
iil'OO %), Radiolaria, Diatoms, 
i' 
(I'OO %), m. di. 0’06 mm., angu- 
lar ; felspar, quartz, mica, 
magnetite, glassy volcanic 
particles, manganese. 
(87 ’64 %), a large quantity of 
amorphous matter with 
minute mineral particles. 
The sounding tube had sunk about 15 inches (37 '5 cm.) 
into the bottom, and brought up about two quarts' (over 
two litres) of the clay, of which the lower layers had a 
blue rather than a red tinge. These lower layers con- 
tained very little, if any, carbonate of lime. One worm 
tube had a deposit of manganese in the in.side. 
*2 '00 %), Sponge spicules, Ra- 
i diolaria, Astrorhizidse, Litu- 
' olidse, imperfect casts of 
1 Foraminifera. 
j 
'] 
(1‘00%), m. di. 0’06 mm., 
angular ; quartz, felspar, oli- 
vine, hornblende, black mica, 
volcanic scoriae. 
(18 ‘62 %), amorphous matter, 
with many minute mineral 
particles, and fragments of 
siliceous organisms. 
The tube had sunk a foot (30 cm. ) into the bottom and 
brought up about a quart (over a litre) of the ooze. The 
lower layers were more compact than the upper. The 
trawl came up fouled. In one of the tow-nets at the 
trawl there were a great many dead empty shells of 
Foraminifera which evidently came from the bottom. 
Some of the quartz particles are about 1 mm. in diameter, 
and sometimes rounded. 
•00 %), Radiolaria, Astror- 
j liizidse, Lituolidse, Diatoms. 
i 
(1 ’00 %), m. di. 0 '06 mm. , angu- 
lar ; quartz, felspar, horn- 
blende, augite, magnetite, 
pumice. 
(30 '33 %), amorphous matter, 
minute mineral particles, 
fragments of siliceous organ- 
isms. 
Although the sounding tube had penetrated the bottom 
to a depth of 15 inches (37 '5 cm.), yet only a small 
quantity of the deposit was brought up. One of the 
tow-nets at the trawl was full of ooze of the same nature 
as that brought up by the sounding tube. In the dredge 
there was a piece of red volcanic scoria, and on passing a 
large quantity of the deposit through fine sieves four | 
or five fragments of rocks were obtained with a 
diameter of about 5 mm. , one formed principally of red 
orthoclase, the others lapilli, probably basaltic. 
■00 %), a few Radiolaria, 
Astrorhizidse, Lituolidse, im- 
perfect casts of Foraminifera. 
I 
(1 '00 %), m. di. 0'06 mm., angu- 
lar ; monoclinic and triclinic 
felspars, hornblende, augite, 
glassy volcanic particles, 
scoriaceous and magnetic 
particles. 
(9 '03 %), amorphous matter, 
fine mineral particles, minute 
fragments of siliceous organ- 
isms. 
Judging from the marks found on the outside, the sound- 
ing tube had sunk nearly a foot (30 cm.) into the deposit ; 
in the inside of the tube there was, however, only a small 
quantity of the ooze. There was a little ooze in the 
tow-nets at the weights and trawl and in the bag of 
the trawl. About six quarts (nearly 7 litres) altogether 
of the ooze were obtained. This was the same as that 
procured by the sounding tube. 
i 
Kio“de la Plata tb Tristan da Cnwha.— continued. 
