REPORT ON THE DEEP-SEA DEPOSITS. 
47 
1 EESIDUE. 
( 
Additional Observations. 
Siliceoua Organisms. 
Minerals. 
Fine Washings. 
j'l*00%), Radiolaria, Sponge 
1 spicules, EhxthdammincL 
] 
\ 
(20‘00%), m. di. OTO mm., 
angular ; felspar, augite, 
magnetite, glauconite, a few 
glassy volcanic particles. 
(71 '85 %), amorphous matter, 
minute mineral particles, a 
few remains of siliceous organ- 
isms. 
In this sounding — which is the deepest taken by the 
Challenger in the Atlantic — the deposit was red on 
the surface, while the deeper layers were greyish, and 
appeared to contain more carbonate of lime than the 
upper. The dredge contained a red coloured mud, but 
no organisms, other than a few dead shells of Foramin- 
ifera. A sounding tube which was sent down attached 
to the dredge gave on the outside some traces of a blue 
mud. The deposit brought home contains some Ptero- 
pods and other Molluscan shells and Foraminifera, 
which appear to have come from a previous dredging, 
possibly from the same dredge having been used. 
During the early part of the cruise there was not so 
much care taken as later. There are, however, some 
things which indicate two distinct layers in this 
deposit. 
1 '00 %), Radiolaria and Sponge 
spicules. 
(I'OO %), m. di. 0'O7 mm., 
angular; sanidine, augite, 
magnetite, tourmaline, epi- 
dote, zircon, glassy volcanic 
fragments (some altered to 
palagonite), manganese grains. 
(92'00 %), amorphous matter, 
with minute fragments of 
minerals and siliceous organ- 
isms. 
Note the increase of amorphous matter with decrease of 
carbonate of lime in these soundings. The organisms 
are few in number, and are in a more or less fragment- 
ary condition. The manganese grains are relatively 
rare. 
I’OO %)i one or two siliceous 
spicules, and fragments of 
:^diolaria. 
(I'OO %), m. di. 0'06 mm., 
angular ; felspar, magnetite, 
glassy volcanic fragments. 
(94 '75 %), amorphous matter, 
with many minute fragments 
of minerals, and a very few 
fragments of sihceous organ- 
isms. 
Only slight effervescence was observed when the deposit 
was treated with dilute acid. Even in the washings of 
a large quantity of the deposit there were few cal- 
careous organisms. 
I'OO %\ ^ few Sponge spicules 
and one or two arenaceous 
Foraminifera. 
(I'OO %), m. di. 0'06 mm., 
angular ; felspar, magnetite, 
minute pieces of pumice, one 
or two manganese grains. 
(79*21 %), amorphous matter, 
many minute mineral particles, 
and a few fragments of sili- 
ceous organisms. 
The organisms obsei'ved in this deposit are very minute, 
and in a more or less fragmentary condition. Dredge 
empty. 
1 '00 %), Radiolaria, Sponge 
spiciiles, Astrorhizidse, ITap- 
lophragmium. 
(I'OO %), m. di. 0'06 mm., 
angular ; a few fragments of 
felspar, augite, palagonite, 
volcanic glass, manganese 
grains. 
(76'16 %), amorphous matter, 
fine mineral particles, and 
fragments of siliceous organ- 
isms. 
A large quantity of the deposit came up in the dredge. 
When this was passed through fine sieves a few pellets 
of manganese, about one millimetre in diameter, were 
obtained, also some pieces of palagonite, and one piece 
of pumice. 
I'OO %), a few Sponge spicules, 
one or two Radiolaria, Haplo- 
phragmium. 
(1'00%), m. di. 0'06 mm., 
angular ; a few fragments of 
sanidine, magnetite, and 
volcanic glass. 
(69 '12 %), amorphous matter, 
minute mineral particles, and 
a few fragments of ^siliceous 
organisms. 
The deposit in the sounding tube indicated the same kind 
of clay as in preceding station. 
1 '00 %), Sponge spicules, Haplo- 
phragmium. 
(I'OO %), m. di. 0'06 mm., 
angular ; felspar, volcanic 
glass, magnetite. 
(43 '30 %), amorphous matter, 
minute mineral particles, and 
small fragments of siliceous 
organisms. 
This deposit contained much amorphous matter. Note 
the increase of carbonate of lime with decreasing depth 
in the last few soundings. 
I'OO %), Radiolaria and Sponge 
spicules, Trochammina. 
(I'OO %), m. di. 0'06 mm., 
angular; fragments of felspar 
and volcanic glass, magnetite, 
augite. 
(28 '39 %), amorphous matter, 
minute mineral particles, and 
fragments of sdieeous organ- 
isms. 
Some of the organisms are macroscopic. The presence of 
fragments of calcareous Algie shows the approach to 
shallower water. 
2 '00 %), Radiolaria, Sponge 
spicules, Rhdbdammina, Haplo- 
phragmiv/m, a few Diatoms. 
(I'OO %), m. di. 0'06 mm., 
angular ; a few fragments of 
felspar. 
(15'14 %), amorphous matter, 
small fragments of siliceous 
organisms and minerals. 
Many of the organisms are macroscopic. Between 10 and 
20 per cent, of the carbonate of calcium contained in 
this deposit is made up of numerous fragments of cal- 
careous Alg£E, a true indication of sudden shallowing of 
water, which the following soundings show. 
1 
St. Thomas to JJermuda — continued. 
