of Edinburgh, Session 1877-78. 
597 
and for the sake of convenience, as well as briefness of reference, 
proposes short geographical names for these basins, which are arranged 
as follows : — 
Short reference names 
proposed to be applied 
to them. 
Area of the Basins. 
]■ Lake Orcadie. 
Lake Caledonia. 
1. The Old Red Sandstone tracts of the north 
of Scotland, embracing the region of the 
Moray Firth, Caithness, the Orkney 
Islands, the mainland of Shetland, and 
perhaps part of the south-western coast j 
of Norway. J 
2. The central valley of Scotland between 
the Highlands on the north and the 
Silurian uplands on the south, including 
the basin of the Firth of Clyde, and 
ranging across the north of Ireland to the 
high grounds of Donegal. 
3. A portion of the south-east of Scotland and ' 
north of England, extending from near 
St Abb’s Head to the Head of Liddes- Lake Cheviot, 
dale, and including the area of the 
Cheviot Hills. J 
4. A district in the north of Argyllshire, ' 
extending from the mouth of the Sound 
of Mull to Loch Awe, and perhaps up 
into the southern part of the Great 
Glen. 
- Lake Lome. 
The Old Red Sandstone region of Wales 
and the border counties of England, 
bounded on the north and west by the 
older palaeozoic hills, the eastern and 
southern limits being unknown. 
The Welsh Lake. 
Lake Orcadie . — After describing the limits of this basin, and 
giving a sketch of the labours of previous observers in the Old Red 
Sandstone tracts of the north of Scotland, the author proceeds to 
examine the evidence for the threefold arrangement of the Old Red 
Sandstone proposed by Murchison. He shows that nowhere are the 
4 K 
VOL. IX. 
