552 
DRS. T. ANDERSON AND J. S. FLETT ON THE ERUPTIONS OF THE 
PLATE 33, FIG. 1. 
The JTIley of the Puibaka Dry Paver, St. Vincent. 
The view is taken from the north hank, looking south across the surface of the sand avalanche towards 
Georgetown. In the foreground the dead trees, eroded hy the sand blast and stripped of their leaves and 
branches, are seen on the back of a ridge which separated the main valley from one of its tributaries. 
Beyond this ridge lie two great semicircular crater-bowls, out of which explosions of steam have been 
emitted. Around each of them there is a low cone, and the fields of ash are covered with stones thrown 
out of the craters. 
PLATE 33, FIG. 2. 
Nearer Tlew of one of the Crater Bowls shown in the 'previous Figure. 
The dark and cold material forming the cone of ejection is sharply defined from the lighter-coloured 
and hot ash of the avalanche beneath. At both sides of the picture transverse sections of the low cone 
surrounding the crater-bowl can be seen. The ash fields around are strewn with stones. In the back- 
groiuid the irregular surface of the deposit is marked in places by flat-topped terraces. The river is 
cutting a new gorge in the foreground, and on the side of this the explosion funnels are situated. 
PLATE 34, FIG. 1. 
Lake of JFater occupying one of the Lateral Valleys opening out into the Main Channel of the Pabaka Dry Paver, 
St. Vincent. 
The rolling surface of the avalanche of sand is seen in the background. On each side of the picture the 
cane-fields of Lot 14 are covered with several feet of ashes, but, as is apparent from the state of the bushes 
Avhich project above the surface, the depth of the layer is inconsiderable, when compared with that of the 
great mass which blocks the valley. 
PLATE 34, FIG. 2. 
Lake of Mud in One of th,e Lateral Valleys lohich Open Out into the Valley of the Pabaka Dry Pivei', 
St. Vincent. 
A deep, narrow gorge has been cut into the soft bedded tuffs which form the southern part of the 
Soufriere. This gorge is obstructed at its mouth by the sand avalanche in the main valle}^, and a lake of 
mud has collected. The rains have stripped the new ash from the slopes, except near their base, but in 
places the irregular surface of the masses which occupied the valley bottom can still be seen projecting 
above the surface of the mud. The forest which clothed the mountain is broken down and destroyed. 
Most of it has vanished, only one stumjj remains erect. In the backgroimd the knife edges of the spurs 
are shining as the light is reflected from the layer of fine ash which still rests upon them. 
PLATE 35. 
The nindward Slopes of the Soufrihe, St. Vincent. 
The mountain is scored with deep ravines, between which lie sharp-backed spurs. On the knife edges 
the fine sand still remains, forming narrow strips which reflect the sunlight. The flanks of the ridges are 
almost cleared of the new ash, which can be seen only in scattered patches. The surface of the older 
