REPORT ON THE DEEP-SEA DEPOSITS. 
147 
Residue. 
Siliceous Organisms. 
Minerals. 
(I'OO %), two or three Eadio- 
laria and a few thin brown 
' imperfect casts. 
;i'00 %), Eadiolaria, imperfect 
casts of Foraminifera. 
2 "00 %), Eadiolaria, Sponge 
spicules, Astrorhizidse, Litu- 
olidse. 
2‘00 %), Eadiolaria, imperfect 
casts of Foraminifera, Litu- 
olidae. 
I’OO %), Eadiolaria, Astror- 
hizidee, Lituolidae, Diatoms. 
I'OO %), a few Eadiolaria and 
Sponge spicules. 
(25'00 %), m. di. 0'60 mm., 
angular ; volcanic materials, 
lapilli, plagioclase, horn- 
blende, augite, olivine, mag- 
netite, palagonite, many 
glassy volcanic fragments 
and coloured altered particles. 
(I'OO %), m. di. 0'06 mm., 
angular ; felspar, magnetite. 
(I'OO %), m. di. 0'07 mm., angu- 
lar ; monoclinic and triclinic 
felspars, hornblende, magne- 
tite, magnetic spherules, 
fragments of volcanic rocks 
with microliths of plagioclase, 
glassy volcanic particles. 
(I'OO %), m. di. 0'06 mm., 
angular ; sanidine, magnetite, 
magnetic spherules, horn- 
blende, manganese. 
(1'00%), m. di. 0'06 mm., 
angular ; felspar, hornblende, 
magnetite. 
Fine Washings. 
(2 '35 %), flocculent amorphous 
matter, a few minute frag- 
ments of minerals and siliceous 
organisms. 
(I'OO %), m. di. O'lOmm., angu- 
lar ; monoclinic and triclinic 
felspars, rounded gi'ains of 
quartz, hornblende, black 
mica, magnetite and magnetic 
particles, volcanic glass, man- 
ganese grains. 
(4 '10 %), flocculent amorphous 
matter, minute mineral 
particles. 
(11 '58 %), amorphous matter, 
small mineral particles, and 
minute fragments of siliceous 
organisms. 
(12 '52 %), amorphous matter 
and minute mineral particles. 
(14'87 %), amorphous matter, 
with many very minute frag- 
ments of minerals and sili- 
ceous organisms. 
(86 '88 %), flocculent clayey 
matter, with many minute 
fragments of minerals and 
Eadiolaria. 
Additional Observations. 
The sounding tube brought up a few pieces of dead shells 
and Corals. In the dredge and tow-net attached there 
was a little of the sand described. Many of the frag- 
ments of rock, shells, and Corals, were quite black from 
a coating of manganese. Some of the small rock frag- 
ments are black vesicular basalt, transforming into 
palagonite. 
The sounding tube brought up about half a quart (over 
half a litre) of the ooze of a uniform colour throughout. 
The pelagic Foraminifera, which make up the greater 
part of this deposit, are relatively of very large size 
compared with those from higher latitudes. 
The sounding tube had sunk about a foot (30 cm. ) into the 
deposit, but with the exception of a few streaks on the 
outside, it brought up no specimen of the ooze ; in the 
dredge and attached tow-nets there were about five 
litres. The percentage of carbonate of lime is the mean 
of three determinations from different parts of the col- 
lected deposit. 
About one litre of the ooze came up in the sounding 
tube. Some of the Foraminifera in this deposit have 
their sm’faces dotted with grains of manganese. A few 
shells are coated with manganese, and the Fora- 
minifera are filled with a red substance which 
remains as an internal cast after treatment with 
dilute acid. 
A sounding was taken at this spot in 1873 (see Station 
102), but only a small quantity of the deposit was then 
obtained. In the present instance a dredge and tow- 
net attached were used and brought up altogether 
over 11 litres of the ooze. Many of the Foraminifera 
are covered and filled with a black or dark brown 
substance. This dark substance, to which the colour 
of the deposit is due, is probably carbonaceous, and 
probably comes from the rivers of the western coast 
of Africa. 
The colour of the deposit is due to the hydrate of iron. 
The sounding tube had sunk 14 inches (35 cm.) into 
the bottom and brought up over a litre of the clay. 
The deeper portions were darker coloured and contained 
less carbonate of calcium than the surface layers. The 
manganese grains and fishes’ teeth were more abundant 
in the lower layer. The shells of the Foraminifera seem 
to be undergoing decomposition, and many of the 
shells split into concentric layers. Some of the 
mineral particles have probably been carried by the 
Harmattan winds from Africa. This deposit resembles 
those taken in the same region in 1873. 
'00 %), Eadiolaria and Sponge 
spicules. 
(1 00 %), m. di. O'lOmm., angu- 
lar ; sanidine, plagioclase, 
rounded fragments of quartz, 
magnetite, augite, manganese 
grains. 
(7 '42 %), flocculent amorphous 
matter, with many minute 
mineral particles and some 
fragments of Eadiolaria. 
The sounding tube brought up about half a liti'e of the 
deposit. The residue of this deposit resembles in most 
of its characters the clays in this region of the ocean 
sound at greater depths. The augite is feebly dicro- 
scopic. The Foraminifera are not so large as those 
nearer the equator. 
Oft' Ascomion-coiUinucd. Ascension Island to St. Vincent. St. Vincent towards Azores. 
