482 Scientific Proceedings, Royal Dublin Society. 
we find the following interesting item :—‘ Two cuts into a swamp 
on the summit, 304 perches at 3s. 6d., £53 4s.” | 
The Bog after the outbwrst.—My. Leonard states that on visiting 
the bog at mid-day on Monday, about eight hours after the out- 
burst, its surface for about a mile above the site of the turf-cutting 
was no longer convex but level. As the escape of fluid material 
continued, the surface correspondingly sank, till a shallow saucer- 
shaped depression was formed, opening by a narrow trough into 
the Carraundulkeen stream. At each side of the mouth of this 
trough there could still be seen the undisturbed ends of the turf- 
cutting; the central portion, for the width of a furlong, had dis- 
appeared. Looking eastwards from this point, a wide, broad valley 
appeared to extend upwards into the bog. On January 2nd, when 
we saw it, this depression was 7 furlongs in length by 5 furlongs 
wide, with a maximum depth of 28 feet. From careful inquiries 
it would appear that the former elevation of the centre of the bog 
above the undisturbed edge of the depression was about 7 feet, so 
that the total subsidence amounted to no less than 35 feet. The 
margin of this collapsed portion of the bog was clearly marked, so 
that we had no difficulty in tracing it on the 6-inch map, from 
which the plan (fig. 1) accompanying this Report is reduced. The 
slope near the side was comparatively steep, lessening towards the 
middle; the steep margin was marked by concentric fissures, 
which, when of sufficient width, were occupied by great masses of 
‘sludge’? which had risen from below. Near the margin, the 
area of these crevasses, as compared with that of the still remain- 
ing upper surface, was about 1:3; the proportion increased to 
about 2:1 near the centre, where also the fissures were no longer 
concentric, owing to the fact that a definite flow of the whole mass 
of the bog had taken place down the valley. Over the two areas, 
marked on the map by close parallel lines, the surface had entirely 
disappeared. Walking round the margin of the depressed area, it 
was observed that, in addition to those portions which originally 
sloped towards the Ownacree, other adjoining areas, which pre- 
viously had sloped towards the east and north, had shared in the 
general subsidence, and now formed a part of the newly-formed 
valley which we have described as opening to the westward 
through the former turf-cutting. This curious feature will be 
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