32 
Hobbs.—Notes on a Trip to the Lipari Islands. 
EXPLANATION OF PLATE I. 
Figure 1. 
View of Volcano looking south from Voleanello, engraved from a 
photograph by Bernard Hobson, B. Sc., taken April 9th, 1889. The dust 
cloud mounting from the crater, which in its initial stages showed but a 
single important lobe, has just sent off lateral lobes the distribution of 
which is very symmetrical to the central lobe. The active fumerole on 
the north lip of the crator (in shadow) gives a smaller volume of 
steam than in the interval between explosions. 
Figure 2. 
“ Bread-crust” projectiles from the Atrio to the west of the Cinder-Cone 
of Volcano. At the left of the figure is a bomb about the size of a tur¬ 
key’s egg, which shows the polyhedal shape, the hard, smooth surface, 
and the peculiar cracking. On the right is a fragment from a bomb 
which was about the size of a man’s head. The piece is three and one- 
half inches high. The upper is the original outer surface and shows a 
vesicular obsidian extending to a depth of about one-half an inch. The 
rest of the material is pumice, the vesicles of which are ellipsoidal with 
their longest axes roughly perpendicular to the original obsidian sur¬ 
face. The size of the vesicles increases toward the center of the bomb. 
