REPOET ON THE DEEP-SEA DEPOSITS. 
55 
Residue. 
Siliceous Organisms. 
Minerals. 
Fine Washings. 
(I'OO %), Sponge spicules, Radio- 
laria, Wmbdammiv/i, Lituo- 
Ud®, Diatoms. 
(I'OO %), m. di. 0'06 mm., 
angular; one or two fragments 
of felspar and volcanic glass. 
(12‘00 %), amorphous matter, 
with small fragments of sili- 
ceous organisms and minerals. 
j(l'00 %), Sponge spicules, Radio- 
i laria, Astrorhizid®, Lituo- 
lid®. Diatoms. 
(I'OO %), m. di. 0'07 mm., 
angular ; a few fragments of 
felspar and volcanic glass. 
(14 '98 %), amorphous matter, 
with fragments of Radiolaria, 
Sponge spicules, minerals, and 
Diatoms. 
1 1 ’00 %) Sponge spicules, one or 
two Radiolaria, Astrorhizid®, 
1 Lituolid®, Diatoms. 
(1'00%), m. di. O'lO mm., 
angular ; felspar, augite, 
pumice. 
(13 '25 %), amorphous matter, 
with fragments of siliceous 
organisms and minerals. 
;1 '00 %), Sponge spicules, Radio- 
: laria, Lituolid®, Diatoms. 
(1'00%), m. di. 0’07 mm., 
angular; felspar, quartz, 
pumice. 
(8 '89 %), amorphous matter, 
fragments of siliceous organ- 
isms, one or two fragments 
of minerals. 
t‘00 %), Sponge spicules, 
Radiolaria, Lituolid®. 
(I'OO %), ra. 'di. 0'07 mm., 
angular; felspar, augite, mag- 
netite, volcanic glass. 
(20 '62 %), amorphous matter, 
with fragments of siliceous 
organisms and minerals. 
. '00 %), Sponge spicules, one 
or two fragments of Radiolaria, 
Lituolid®. 
(1 '00 %), m. di. 0'07 mm., 
angular; fragments of sanidine, 
augite, hornblende, magnetite, 
glassy volcanic particles. 
(43 ’41 %), amorphous matter, 
with minute fragments of 
minerals and siliceous organ- 
isms. 
■00 %), Radiolaria, Sponge 
j spicules, Haplophragjnium. 
(3 '00 %), m. di. 0'08 mm., 
angular and rounded ; mono- 
clinic and triclinic felspars, 
quartz, magnetite, horn- 
blende, glassy particles, 
glauconite. 
(64 '62 %), amorphous matter, 
with minute fragments of 
minerals and siliceous organ- 
isms. 
1 '00'%), Sponge spicules, 
j a few Radiolaria, glauconitic 
casts. Diatoms. 
1 , 
! 
(60'00 %), m. di. 0‘15 mm., 
angular and rounded ; mono- 
clinic and triclinic felspars, 
quartz, glauconite, fragments 
of mica-schist and older vol- 
canic rocks, garnet epidote, 
magnetite, augite, actiiiolite, 
volcanic glass. 
(30 '98 %), amorphous matter, 
with fragments of minerals, 
Radiolaria, and Diatoms. 
Additional Observations. 
These deposits off Bermuda, together with those taken in 
March and April, as well as many others not described 
but which are marked on the accompanying chart, show 
that the quantity of carbonate of lime increases as the 
reefs are approached, and the water shallows. The car- 
bonate of lime is, neai the reef, almost wholly derived 
from the reef organisms ; as the distance from the reef 
^ increases the remains of pelagic animals become more 
and more abundant, the remains of the reef organisms, 
on the other hand, diminishing. The Coral Sand passes 
into a Coral Mud, this into a Globigerina Ooze, and in 
very deep water far from the reefs the Globigerina Ooze 
is replaced by a Red Clay ; some of the deeper deposits 
in this series might be called Globigerina Oozes. See 
Plate XIII. , which shows the variation of the deposit 
with depth and distance from the reef. 
J 
This deposit, which is about 60 miles from the reefs, 
does not appear to contain any fragments of reef 
organisms. 
The quartz grains are covered with limonite, while 
there are also, among the minerals, fragments with 
chloritic coatings. Trawl had not reached the bottom. 
From the large percentage of minerals this deposit 
might equally well be called a Blue Mud; the minerals 
are evidently all ice-borne. Glauconitic casts of some 
of the organisms remained after treatment with acid. 
N ote the decrease of carbonate of lime with increase 
of depth. Trawl brought up no deposit, but some 
concretions covered with manganese. 
J 
Ofl' Bcrnuula. Ilernuula to Azores. 
