GLENGARIFF GRITS AND SLATES. 723 
he stated that Prof. Dewalque had arrived at the conclusion that 
the marine Devonian beds of Devonshire and Old Red Sandstone 
of Hereford were different conditions of beds on the same horizon. 
In reply to Dr. Hicks, he stated that all paleontologists were agreed 
as to the Upper Silurian age of the beds below the Glengariff Grits ; 
and the Lower Silurian age of the metamorphic rocks is proved by 
the occurrence in them, when unaltered, of Lower Silurian Grap- 
tolites. In reply to Dr. Duncan, he stated that the Carboniferous 
Slate of Ireland was probably on the same horizon as the Upper 
Devonian of Devonshire. 
