F. A. Perret — Lava Eruption of Stromboli. 445 



account of the great explosive paroxysms of 1907 and 1912. 

 These, together with the recent eruption, constitute a group of 

 events markedly analogous to the eruptions of other volcanoes, 

 the first two in the formation of a vast crateral abyss and the 

 last in the amplitude and duration of the lava flow. 



It will be well first to take a comprehensive view of the 

 initiation and progress of the eruption in the preceding months, 

 as shown in the records of the Stromboli Semaphore Service, 

 kindly furnished by the Chief, Signor D'Aloisio, to whose 

 courtesy and hospitality the writer is deeply indebted. 



It should be remarked that these records also contain notes 

 to the effect that in April and in June of 1914* there were 

 " eruptions of lava " — probably not true continuous flows but 

 ejections from the crater on to the Sciara, which certainly indi- 

 cate a high lava column with a tendency to overflow. 



On the 18th of June, 1915 (and possibly also on the 11th), 

 there was an eruption of lava which ceased the same day. 

 Small shock. 



From July 1 to 24, lava in quantity, and from the 25th to 

 31st, in lesser amount. Increased explosive effects at crater. 



During the month of August, continuous emission, always 

 in moderate amonnt. 



September 1 to 11, in considerable quantity ; 15 to 23, less ; 

 from 25 to 30, abundant. 



In great quantity during the entire month of October, and 

 during the first week of November. Also emissions of ash 

 and lapilli. 



The rest of the month may now be summarized briefly from 

 the writer's observations : 



November 1 — Explosions from Bocca A of the crater at 

 intervals of ten to fifteen minutes, with projection of luminous 

 fragments to a considerable height. Ample outflow of lava, 

 forming the most westerly of the streams on the Sciara, and 

 flowing to within a few meters of the sea. 



November 9 — Same conditions at crater. Lava flow dimin- 

 ished. Great accumulation of lava at about the middle of the 

 descent. Lower extremity immobile. 



November 10 — Weaker explosions from Bocca A often fol- 

 lowed by landslips within the crater, indicating a sinking lava 

 column. Outflow of lava entirely or almost ceased. 



November II — Gradual diminution of all activity. 



November 12 — The explosions in Bocca A proceed from a 

 constantly lowering lava column, and scarcely reach the crater's 

 edge, but the glow continues. The lava has ceased flowing, 

 but the lava bocca is incandescent. 



* " I fenomeni eruttivi avvenuti alio Stromboli dal 1909 al 1914, ed il loro 

 meccanismo," O. De Fiore, Zeitschr. f. Vulkanologie, i, p. 236, 1915. 



