1890 - 91 .] Mr J. Y. Buchanan on Sulphur in Marine Mucls. 27 
No. 4. — The mud from the Sound of Raasay, off the west coast of 
Ross-shire, was dredged from 150 fathoms, and consisted of very fine 
soft grey mud, which on washing left a large residue of coprolitic 
pellets. 
No. 5 is a similar mud from Loch Duich, also in Ross-shire ; it 
harboured many annelids. 
No. 6 is from the station in Loch Fyne, where, for the first time, 
manganese nodules were obtained in comparatively shallow water. 
It is a sandy clay with many dead shells. 
No. 7 is the red clay from 90 fathoms in the Firth of Clyde, off 
the north-east part of the Island of Arran, which has already been 
referred to. It is a very fine red ochreous mud, much resembling 
the oceanic clays. On washing, it is found to he almost com- 
pletely moulded into coprolitic pellets, and supports an abundant 
ground fauna. Like oceanic clays, on careful washing, grains of 
peroxide of manganese can he isolated, and it contains over 1 per 
cent, of phosphoric acid. 
No. 8 is red clay from lat. 18° 56' N., long. 59° 35' W., depth 
2975 fathoms, in the western basin of the North Atlantic. 
No. 9 is a coating of peroxide of manganese from an oceanic 
concretion, but the locality has been, omitted to be noted. 
No. 10 is mud from 115 fathoms in the channel between the 
Island of Searba and the Garvelloch Islands, about twenty miles 
S.W. of Oban. Peroxide of manganese is very abundant here as 
a coating on dead shells. 
No. 11 is from the upper basin of Loch Fyne, in 60 fathoms. 
The mud here contains a remarkably large amount of sulphur. The 
upper basin of a sea loch is, as regards many of its conditions, and 
notably as regards the nature of the mud at its bottom, in a state 
intermediate between that of the open sea and that of a fresh-water 
lake. The mineral constituents are usually in a lower state of 
oxidation than outside; and this is accompanied by, and partly 
due to, the relatively large amount of vegetable debris from the 
land. All these circumstances may retard the disappearance of the 
sulphur. 
Nos. 12 and 13 are globigerina oozes from the Pacific and the 
Atlantic respectively, their particular locality not noted. 
No. 14 is from the same locality as No. 10. 
