3 i6 SCOTT'S LAST EXPEDITION [June 
This evening the Soldier tells me he has eaten his food, 
so I hope all will be well again. 
Friday, June 16.— Overcast again— little wind but 
also little moonlight. Jimmy Pigg quite recovered. 
Went round the bergs in the afternoon. A great deal 
of ice has fallen from the irregular ones, showing that 
a great deal of weathering of bergs goes on during the 
winter and hence that the life of a berg is very limited, 
even if it remains in the high latitudes. 
To-night Debenham lectured on volcanoes. His matter 
is very good, but his voice a little monotonous, so that 
there were signs of slumber in the audience, but all woke 
up for a warm and amusing discussion succeeding the 
lecture. 
The lecturer first showed a world chart showing 
distribution of volcanoes, showing general tendency of 
eruptive explosions to occur in lines. After following 
these lines in other parts of the world he showed difficulty 
of finding symmetrical linear distribution near McMurdo 
Sound. He pointed out incidentally the important 
inference which could be drawn from the discovery of 
altered sandstone in the Erebus region. He went to the 
shapes of volcanoes : 
The massive type formed by very fluid lavas — 
Mauna Loa (Hawaii), Vesuvius, examples. 
The more perfect cones formed by ash talus — Fujiama, 
Discovery. 
The explosive type with parasitic cones — Erebus, 
Morning, Etna. 
Fissure eruption — historic only in Iceland, but best 
