THE VOLCANOES AND ROCKS OF PANTELLERIA 669 
supply of potable water by covering the openings with brushwood, 
which condenses the steam and gives rise to a variable trickle of 
water. The Stufa di Khasen is situated in the northwest corner 
of the island, near the Cuddie Rosse, and the vapors issue in a 
deep grotto, which was walled up and converted into a hot-vapor 
bath, apparently by the Arabs. There are other fumaroles below 
the Rione Miliac, at the summit of Montagna Grande, and in the 
crater of Cuddia Mida, as well as one, the Grotta di Bagno Asciutto, 
near Monte Gibilé a. The occurrence of these fumaroles around 
the Montagna Grande block is quite consonant with the presence 
M.Gelkcser 
C Micka 
rlLanda 
Pkharace 
S.Gh 
3 
~~ 
YY. 
d 
= 
2 
ov 
i 
M.S Elmo 
C Zenete 
> MW Grande 
M.Gebele 
; POM 
PantelleritieTrachyte dit Avgivite Pantellervte 
ZAZA PUTO 
Hyalohantellerite. ee Feldshear Basalt. 
FIG. 5 
Pankellarite Pumcee 
SS Tracwyte 
of a line of fracture. The hot springs occur in various parts of 
the island, chiefly near the shore, while others are found at the 
southeast corner of the Bagno dell’ Acqua. Foerstner gives two 
analyses, from which it appears that the waters of the lake are high 
in soda, with some potash, chiefly as chlorides, with less sulphates 
and carbonates. 
To sum up, my idea of the volcanic succession may be briefly 
put thus: 
Phase I: Building-up of a large cone, composed of flows of pan- 
telleritic trachyte, comendite, and lastly green pantellerite. Atta- 
lora and Gadir and Monte Sant’ Elmo are parasitic cones of this. 
