260 Scientific Intelligence. 
Symonds contended that it applies also to South Wales, almost the whole 
of which he believes to have been submerged during this glacial marine 
riod. Accompanied by his friend, the Rev. Jas. Hughes, he b 
crossed the hill of Craig Turch this summer, where the river Cothi rises, 
which must have been dropped into them by floating ice. — The author 
thinks some of the more elevated mountain platform drifts of South 
Wales must be attributed to the same origin—viz., a glacial marine 
rigin. 
But, while believing that there are unmistakable proofs throughout 
Siluria of long perigd : 
proved by the position of marine boulder-bearing drifts at different eleva- 
tions, the author maintained that the effects of land-ice and snow im 
transporting great masses of local rocks to long distances had not been 
sufficiently observed. He always suspected the ice-raft or iceberg theory 
action of any kind, and, though belonging to rocks in situ in the district, 
nate Ree arses ; ie: 
while as regards the erratics borne by icebergs they are mingled and 
erogeneous. On many hills in Wales jee dieins boulders of entirely 
ill si i : i ) 
loeal origin studding hill sides 0 ks to which they de 
not belong, but they have a local distribution, and have been de 
a local eenter. He also that in numerous instances 
e. case 
Forest, where masses of millstone grit and mountain limestone are found 
on one side of the fe eh can be found on the hills across 
to aday to the rocks im sita on the hills, and did not sou 
times depart from one direction and strand large masses somewhere out 
of the line of the existing valleys and the lines of the hill slopes. The 
