VOLCANOES 339 
in the volcanoes of Hawau (Fig. 199). Sometimes 
after a crater has ceased activity, an eruption may 
break forth on the sides of the cone; and then a 
new crater may be built, as in the case of Mount 
Shasta, where Shastina has grown on the flanks of 
Shasta im the form of a later and smaller cone 
(Fig. 205). Even a more recent cone has been 
formed near the base of Shasta, this being that of 
Lassen Peak. 
Some volcanoes are 
in almost constant 
eruption, as Vulcano 
(Fig. 206) and Strom- 
boi in the Lipari 
Islands of the Medi- 
terranean. The action 
is moderate, and ves- 
Fic. 206. 
sels sail past the vol- Ee 
t Vulcano, Lipari Islands, in eruption. 
cano without danger, } 
even while the eruption is in progress. On the other 
hand, most volcanoes are in eruption only at periods 
several years apart. Often volcanoes which were sup- 
posed to be extinct have burst forth again. Krakatoa, 
in the Straits of Sunda, after being quiet for about a 
century, became suddenly active, in the fall of 1883. 
This was the most violent volcanic outbreak that has 
occurred im recent times (p. 343). 
