480 ADDRESS OF T. STERRY HUNT. 
I am convinced that these crystalline schists of Germany, Angle- 
sea, and the Scotch Highlands, will be found, like those of Nor- 
way, to belong to a period anterior to the deposition of the 
Cambrian sediments, and will correspond with the newer gneissic 
series of our Appalachian region. There exists, in the Highlands 
of Scotland, a great volume of fine-grained, thin-bedded mica- 
schists with andalusite, staurolite and cyanite, which are met with 
in Argyleshire, Aberdeenshire, Banffshire and the Shetland Isles. 
Rocks regarded by Harkness as identical with these of the Scottish 
Highlands also occur in Donegal and Mayo in Ireland. Throug 
the kindness of the Rev. Prof. Haughton of Trinity College, and 
Mr. Robert H. Scott, then of Dublin, I received some years since, 
a large collection of the crystalline rocks of Donegal, which 
I am thus enabled to compare with those of North America, and 
to assert the existence in the northwest of Ireland, of our second 
and third series of crystalline schists. The Green Mountain rocks 
are there exactly represented by the dark colored chromiferous 
serpentines of Aghadoey, and the steatite, crystalline tale and 
‘actinolite of Crohy Head; while the mica-schist of Loch Derg; 
with white quartz, blue cyanite, staurolite and garnet, all united 
in the same fragment, cannot be distinguished from specimens 
found at Cavendish, Vermont, and Windham, Maine. The fine- 
grained andalusite-schists of Clooney Lough are exactly like 
those from Mount Washington; while the granitoid mica-slates 
from several other localities in Donegal are not less clearly of the 
type of the White Mountain series. Similar micaceous schists, 
with andalusite (chiastolite), occur on Skiddaw, in Cumberland, 
England, the relations of which have been clearly defined by Sedg- 
wick, who groups the rocks of Skiddaw into four divisions. 7 
rocks, not described lithologically, with mineral veins, “ having 
some resemblance to the ròcks of Cornwall,” and including 
towards the summit, “ chiastolite schists and chiastolite rocks.” 
These are followed in ascending order by two great series of slates 
and grits, succeeded by a fourth division of schists, sometimes 
carbonaceous, holding in parts facoids and graptolites, which are 
apparently overlaid discordantly by sundry trappean conglomer 
ates and chloritic slates.* The graptolites of the Skiddaw slat . 
+ Synopsis of British Paleozoic Rocks, p. Ixxxiy, being an introduction to MeCoy’s 
Brit. Pal. Fossils (1855), 
