Dr. H. J. Fohnston-Lavis—The Ponza Islands. 7 533 
_ Fie. 2.—Szcrton or Lavas, Turrs, Pumrices, AND A SMALL Votcanic Conn 
BETWEEN ‘‘It TELEGRAFO” AND THE “ TERRA ABBANDONTA,” VENTOTENE. 
a, 6, Sea-level. 
37-36. Scoria, dust, ete. 
39. Doleritic lavas (lower). 
34-28. Lower pumices and other explosive eruptive products. 
27. Doleritic (upper) scoria forming section of toe of small volcanic cone. 
26-8, Upper pumices and other explosive eruptive products.. 
d 
Fig. 8.—DIAGRAM OF THE SECTIONS OF A VOLCANIC CoNE SEEN IN CLIFFS OF 
VENTOTENE. 
a. Toe; 6. rim ande. vent ; . and y. parts removed; d, d. North-west and ¢, e. S.E- 
coast-lines. 
With (25) recommenced a series of explosive eruptions (25-8), 
which culminated in a gigantic one represented by the different 
pumices, scoriaceous pumices and tuffs (7-4). Of course it is 
impossible to say at what point all these pumice and dust deposits 
were erupted, and it is not improbable that they were derived from 
different eruptive centres. The last seems to have been very near 
