244 On the Laurentian Rocks of Donegal and of other parts of Ireland. 
The late Professor Harkness, “On the Metamorphic Rocks of the North of 
Treland.’* In this paper the author gives an account of the succession of the rocks 
between Malin Head and Inishowen Head, which, with the succeeding chloritic 
schists, he considers the Irish representatives of the strata of the Grampians. 
Mr. R. H. Scott, “ On the Granitic Rocks of Donegal, and the minerals associated 
therewith.”+ In this paper the author offers evidence that the typical Donegal 
granite, with its associated strata of limestone, &c., were never in a melted condi- 
tion, but were originally stratified rocks, which have undergone metamorphism. 
He considers there is a close relationship between these rocks and the granites of 
Norway. 
Professor Harkness, ‘(On the Rocks of portions of the Highlands of Scotland and 
their equivalents of the North ot Ireland.”{ In this paper the author deals with the 
age of the quartzites, limestones, and schists of the promontory of Inishowen, which 
he identifies with the beds of the Scottish Highlands, south of the Caledonian Canal, 
lately shown to be of Lower Silurian age through the researches of Sir R. L 
Murchison. : 
Dr. T. Sterry Hunt, F.R.S., “On the Chemical and Mineralogical Relations of 
Metamorphic Rocks.”§ The author, after discussing the origin of these rocks, and 
describing the metamorphic groups of North America, adds—“ Many of the rocks 
of Donegal appear to me lithologically identical with those of the Laurentian period ; 
while the serpentine of Aghadoey, containing chrome and nickel, and the anda- 
lusite and kyanite schists of other parts of Donegal, cannot be distinguished from 
those which characterize the altered palzeozoic (Lower Silurian) strata of America.” 
This paper contains the first intimation of the Laurentian age of the gneissose rocks 
of Donegal. 
Rev. Dr. Haughton, F.R.S., ‘‘On the Granites of Donegai.”|| In this paper the 
author describes the range of the granites and their mineral constitution. He states 
that the granite of Donegal appears to be interstratified with the quartz rock, mica 
slate, and limestone, with which it is associated ; but that it is probably subsequent 
to them in age, and in its central portion is, perhaps, of igneous origin. 
Elaborate analyses of a number of specimens are given, as also tables of joint 
planes and descriptions of sections. 
* British Association Reports, 1860. Trans. of Sections, p. 79. 
+ British Association Reports, 1861. Trans. of Sections, p. 131. 
+ Quarterly Journal Geol. Soc. London. Vol. XVIL., p. 256 (1861). 
§ Journal Geol. Soc., Dublin. Vol. X., p. 85. 
|| Transactions Royal Irish Academy. Vol. XXIV. Part 9. 
