576 Scientific Proceedings, Royal Dublin Society. 
draining directly across the ridges, as overflows from lakes held in 
between the ice margin and the bare land, or as having been cut 
by rivers flowing on the surface of the ice-sheet, just as the ridges 
emerged from it. 
Certain passages: were also brought to my notice by Mr. 
Lamplugh, which are of interest as showing that even the earlier 
local geologists took note of these gaps, and recognized the diff- 
culty of accounting for them. As early as 1811, in Stephens and 
Fitton’s Mineralogy of the Vicinity of Dublin' the following 
passage occurs :— 
“ At the foot of the mountains near this place” (7.e. Dundrum) 
‘ig one of the fissures already mentioned as somewhat resembling 
the Scalp in structure, the course of which is from west to east, 
parallel to the face of the mountain.” There is also a descrip- 
tion of the Scalp, and the foot-note—“ Fissures similar to the 
Scalp though on a much smaller scale occur in other parts of the 
granite tract near Dublin, as at the foot of the mountains above 
Dundrum, and elsewhere. The mode of their formation offers an 
interesting subject of inquiry.” 
John Scouler, in 1838, in a paper ‘“‘On the Raised Beaches 
near Dublin,” has the following passage :— 
“There is also another very curious ahencmnemon which, I 
think, may be associated with the preceding one” (@.e. the high 
level shelly gravels). ‘‘ Besides the valleys, whose streams dis- 
charge themselves into the Bay of Dublin, and which we have 
seen have all been formerly blocked up by transported matter, 
there is another set of valleys, or more correctly ravines, which 
have a general easterly and westerly direction, and are conse- 
quently nearly at right angles to the valleys containing trans- 
ported matter, and these ravines are all destitute of any beds of 
gravel or detritus carried for a distance. The valleys or gaps 
which possess this negative character are the Scalp, the Dargle, 
Finger Lakes of New York. Appendix B. Report of the Director of the New York 
State Museum, 1899.’’ Review in Journal of Geology. 
J. E. Wilson: ‘‘On a Glacial ‘ Extra-Morainic’ Lake occupying the Valley of the 
Bradford Beck.’’ Rep. Brit. Assoc., 1900, Bradford, p. 755. 
Albert Jowett, m.sc., and Herbert B. Muff: ‘‘ A Preliminary Note on the Glaciation 
of the Keighly and Bradford District.” Rep. Brit. Assoc., 1900, Bradford, p. 756. 
1 ¢¢ Notes on the Mineralogy of part of the Vicinity of Dublin, taken principally from 
the Papers of the late Rey. Walter Stephens, a.m.,’’ by William Fitton. London, 1811. 
