J. F. CAMPBELL ON GLACIAL PERIODS. 137 
of which there is any geological record, and that it 
has endured ever since any part of the earth’s sur- 
face was high enough and cold enough to be a con- 
denser of snow. TI hold that the record of sedi- 
mentary geology is continuous, and does not record 
periods of great cold. I will exchange my opinion 
for an equivalent of facts; meantime I submit 
it with my facts to the Society to which I have 
the honour to belong, after studying the subject 
for nearly forty years*. 
I have tried to express the facts relied upon by 
a diagram. The diagonal line expresses height 
above the sea-level. At 60° glaciers now enter 
the sea. Icebergs drift in the sea to 37° N. and 
to 36° 8. Glaciers now exist in the Himalayas 
at 27°N. 
The limits of ancient glacial action, recorded 
by marks, do not extend beyond these latitudes, 
so far as I have been able to discover. 
P.S.—January 13, 1879.—Since this paper was 
presented in May 1877, I have cruised about the 
Hebrides several times, and printed a paper on 
the Parallel Roads of Glenroy, which I hold 
to be “‘ sea-margins,” like others on Scotch and 
other coasts. I have been up the Nile beyond 
Thebes, in Syria, at Jerusalem, and along the = | & 
coast of Asia Minor. I sought carefully and 
found no records of glacial action about that part 
of the Mediterranean. Iam prepared to maintain 
that the Nile valley, the Red Sea, and the Valley 
of the Jordan differ from “ firths ;’ that the Dead 
Sea and neighbouring lakes, the Caspian, and the 
Black Sea are not ‘lakes of glacial erosion,” but 
hollows otherwise formed, probably by great move- 
ments and bending in the earth’s crust. These 
are indicated by sea-shells at Suez and otherwise. 
I have read much on the subject of glacial action, 
nothing that shakes my confidence in the con- 
clusions stated in this paper, but a good deal 
which leads me to hope that many leading geo- 
logists at home and abroad will be of my opinion 
if they read this abstract of the geological work 
of some forty years. 
009 
aM lip ch 
MAA ae i 
: SAM aM 
VIRAL SDS 
008 o0L 
“puvpusery 
* A globe coloured to show the present position of ice, 
so far as known to the author, was shown on the 26th of 
June, 1877, at the rooms of the Society, together with books 
of sketches and rubbings, geological and other maps, in 
illustration of this paper. These were removed on the - 
30th of June, and can be referred to at Niddry Lodge, a = 2 
Kensington, W. Ses 
A 
000°0S 
