492 Scientific Proceedings, Royal Dublin Society. 
valley to the southward, forcing before it not only the clamps of 
turf, on the edge of the bog, but even patches of the moory 
meadows, to the depth of several feet, the grassy surface of which 
heaved and turned over almost like the waves of the ocean; so 
_ that, in a very short space of time, the whole valley, for the 
breadth of about a quarter of a mile between the bog-edge and 
the base of the hill of Lisanisky, was covered with bog to a depth 
of from 8 to 10 feet, and appeared everywhere studded with 
green patches of moory meadow. ... A considerable deposit 
of heavy, black bog-mud,... at present fills the bottom of the 
stream... 
“In the centre of the bog, for the space of about one mile 
and a-half in length, and a quarter of a mile in breadth, a valley 
has been formed, sloping at the bottom from the original surface 
of the bog to a depth of 30 feet, where the eruption first took 
place. In this valley or gulf there are numberless concentric cuts 
or fissures filled with water nearly to the top. 
“The valley between the edge of the bog and the road of 
Kilbride, for a length of half a mile, and an extent of between — 
60 and 80 acres, may be considered as totally destroyed. It is 
covered by tolerably firm bog from 6 to 10 feet in depth, consist- — 
ing at the surface of numberless green islands, composed of — 
detached parts of the moory meadows, and of small rounded ~ 
patches of the original heathy surface of the bog, varying from — 
2 to 10 feet in diameter, which are separated from each other by 
brown pulpy bog; and the bed of the original stream is elevated to — 
about 8 to 10 feet above its former course, so as to flow over the road. 
... The whole distance which the bog has flowed is about 3 miles — 
in length, namely one mile and a half in the bog, and the same — 
distance over the moory valley; and the extent covered amounts 
to about 150 acres.’ : 
Sir William Wilde gives the following additional particulars — 
taken from the daily press of the time :— 
“At 7p.m., of the evening of the 26th of June, the south front 
of the bog of Ballykillion, or Kilnalady, gave way to a depth of 
25 feet, and, with a tremendous noise, commenced to move down 
1 Journal of the Royal Dublin Society, vol. i., pp. 141-144 and map, 1858. 
