EEPORT ON THE DEEP-SEA DEPOSITS. 
13l' 
RESIDUE. 
cd- 
Siliceous Organisms. 
Minerals. 
Fine Washings. 
Additional Observations. 
Radiolaria, Astrorhizid*, Lituo- 
lidie, arenaceous Textularidae. 
(1'00%), Radiolaria, Sponge 
spicules, Astrorhizidfe, Lituo- 
lidte, arenaceous Textularidee. 
86 (I'OO %), Radiolaria, Sponge 
spicules, Astrorhizidae, Litu- 
olidfe. 
05 (4'00 %), Radiolaria, Reophax, 
casts of Foraminifera, Dia- 
toms. 
Particles of volcanic glass some 
of them black, and minute 
rock fragments. 
(O'OO %), m. di. O'lO mm., angu- 
lar ; plagioclase, augite, al- 
tered olivine, many white 
glassy volcanic splinters, pala- 
gonite, phillipsite in single 
crystals and fihro -radiating 
aggregations, magnetite, man- 
ganese grains. 
(1'00%), m. di. 0'08 mm., 
angular ; manganese gi’ains, 
plagioclase, magnetite, a few 
isolated yellow crystals of 
phillipsite, augite, glassy vol- 
canic particles. 
(1 '00 %), m. di. 0'07 mm., 
angular ; felspar, plagioclase, 
pumice, augite, quartz, mica, 
hornblende palagonite, glau- 
conite. 
(31 '66 %), much fine amorphous 
matter, a few mineral frag- 
ments, and remains of siliceous 
organisms. 
(26 ’85 %), a quantity of dark 
red-brown, very fine grained, 
amorphous matter, some 
mineral fragments. 
(89’35 %), much blue-grey 
amorphous matter, some 
mineral and siliceous remains. 
The water in the sounding tube on being allowed to 
settle deposited some brown coloured sediment, com- 
posed of Olobigcrina, Pulvinulina, Echini spines, 
Ostracode valves ; a good many small manganese par- 
ticles, and many small red mineral fragments were 
also observed, as also a few Uvigerina. Altogether, 
this indicates a red coloured Globigerina Ooze. In 
the tow-net at the weights there were an angular 
pebble about one inch (25 mm.) long, and a great 
many small rock fragments, measuring from 1 to 5 mm. 
in diameter, some of them augitc-andesite. 
Two layers were noticeable in the tube, a straw coloured 
upper and a dark brown lower. The upper layer con- 
tained the organisms noted, while in the lower layer 
the organisms were few and manganese abundant. A 
small nodule (the size of a pea) was observed. In the 
washings of the ooze from the trawl there were a few 
volcanic pebbles, some of them ti'ansformed into pala- 
gonite. 
There was no trace of deposit in the tube, except a few 
shells of Globigerina at the valves. The trawl brought 
up a large quantity of manganese nodules (3 to 4 
quarts = 3 '4 to 4 ’5 litres) varying from the size of a pea 
to that of a hen’s egg. One of the tow-nets at the trawl 
was full of a yellow coloured ooze in which were many 
rounded manganese nodules. The nuclei of some of 
the larger of these nodules are composed of a yellow or 
dark green material easily cut with a knife, showing 
the last stage of decomposition of palagonite. There 
were some lumps of the ooze, in the tow-net, showing 
the beginning of the nodule formation. 
A section of about a foot (30 cm.) of mud of a blue colour 
was in the tube ; on the surface there was a layer of a red- 
. dish colour which gave no trace of carbonate of lime on 
treatment with acid. The tow-nets at the trawl had 
each a little mud of a red or brown colour which did 
not effervesce with acid ; evidently from the surface 
layers of the deposit. In a tow-net there was a man- 
ganese nodule, flat and round, about one inch (25 mm.) 
across and one and a quarter inches (31 mm.) thick, 
with a neueleus of pumice, also portions of a Cepha- 
lopod beak, and two pieces of twigs. Many excreta 
of Echinoderms are present. Imperfect casts of Fora- 
minifera remain after treatment with dilute acid. 
00 
(I'OO %), Lituolidae, arenaceous 
Textularidae, Diatoms. 
(I'OO %), m. di. 0'06 mm., 
angular ; felspar, plagioclase, 
hornblende, white or yellow- 
ish mica, olivine, magnetite, 
quartz (rare). 
(98‘00 %) much gi-eenish 
amorphous matter, fine 
minerals, and a few siliceous 
remains. 
No effervescence is noticed when the mud is ti-eated with 
dilute acid, but a strong smell of sulphuretted hydrogen 
is evolved. The mica and olivine are both altered and 
yellowish or nearly opaque. The particles are very 
small for a shore deposit. 
Tahiti to Valparaiso — continued. 
