Reviews— Geological Survey of Great Britain. ov 
that most of the American species occupy the Atlantic coast region in 
the British Islands. Almost all the southern or Lusitanian species 
are found in precisely the same area in England, Ireland, and Scotland. 
This seems to me partly due to the fact that the temperature was 
considerably higher there during the Glacial period than in the more 
inland localities. Even now the plants are under more favourable 
climatic conditions on the west coast than further inland, and less 
exposed there to competition with the stronger eastern rivals. More- 
over, almost the whole of Ireland and a large portion of England are 
thickly swathed in a mantle of Glacial clay. We can only suppose 
that the forces which controlled the deposition of this clay were less 
effective on the west coast, which may have extended far to the west 
of its present boundary, and have thus given rise to the preservation of 
many species of animals and plants which were destroyed elsewhere. 
REVIEW S.- 
——_>——_ 
I.—GroLtocgicaL Survey or Great Briratn. 
1. Tuer Grotocy oF tHE Seaspoarp or Mrp ARGYLL, INCLUDING THE 
Istanps oF Lurne, ScaRBA, THE GARVELLACHS, AND THE LESSER 
IsLESs, TOGETHER WITH THE NORTHERN PART OF JURA AND A SMALL 
portion oF Mutt. By Dr. B. N. Peacu, F.R.S., H. Kynasrton, 
and H. B. Murr [Mavre|; with contributions from S. B. 
Witxinson, J. S. Grant Watson, J. B. Hitt, A. Harker, F.R.S., 
E. B. Bartey, and petrological notes by Dr. J. 8. Frerr. 8Vvo; 
pp. vii, 121, with 7 text-illustrations and 8 plates. Glasgow, 1909. 
Price 2s. 3d. 
E cannot refrain from a feeling of sympathy with librarians, who 
give cross-references in their catalogues, at the lengthy title 
and array of authors and contributors imprinted in this memoir. The 
field-work, however, has been carried out by many hands in a very 
diversified region, comprising a number of islands and parts of 
islands, together with the western seaboard of Argyllshire, from 
Easdale and Kilmelfort on the north, to the plateau beyond the 
Crinan Canal on the south. 
Nearly the whole of the area described is made up of various 
metamorphic rocks, including the Craignish and Ardrishaig Phyllites, 
the Easdale Slate and Limestone Group, and the Quartzite Group, 
together with epidiorites. No less than fifty-two pages are given to 
the description of these rocks, and of the folding, metamorphism, 
the crush-conglomerates, and thrust-planes; while the subject is 
illustrated by remarkable photographs of pseudo-conglomerate and 
strain-slip cleavage, of folds, boulder-beds, and phacoids of epidiorite. 
Rocks of Lower Old Red Sandstone age occur on the mainland north 
of Loch Melfort, and in the islands of Seil and Lunga; and they 
consist mostly of andesitic lava-flows, with here and there some 
shales, grits, and conglomerates, as well as tuffs and agglomerates. 
There occur also masses of diorite and granite, together with dykes 
and sills of other intrusive rocks, and these, with the effects of contact 
metamorphism, are duly described. 
