268 
Dr Daubeny on the Geology of Sicily. 
The volcanic rocks of Sicily are, at least, of two epochs ; 
namely, Antediluvian, which alternate with calcareous rocks, in 
the Val di Noto, in the southern part of the island. 5thly , 
Postdiluvian, which comprise the greater part of the lavas that 
have flowed, at different times, from Mount Etna. It is pro- 
bable that this mountain was burning, at a period antecedent to 
the time of Plomer ; and there are volcanic rocks at its foot, 
which seem to have been produced anteriorly td the commence- 
ment of the present order of things. 
APPENDIX. 
In order to fulfil my promise of furnishing to others the means 
of correcting the errors into which I may have fallen, I subjoin 
the following sketch of the route which the geological traveller 
should take, in order to obtain as complete a view as possible, 
in a short time, of the physical structure of the island. 
1st day. Messina to Melazzo. Promontory to be examined. 
2. To Giojusa. Antiquities of Tyndaris. 
3. Santa Agata. f 
4. Cefalu. Cyclopean ruins. 
5. Termini. Baths. Madonia. Mountains near. 
6. Palermo. Recent Breccia of Bagaria lies on the road. 
1st day. Palermo to Alcamo. 
2. To Trepani. Temple of Segeste on the road. 
3. Marsala. At Trepani Monte Giuliano, formerly Mount Eryx. About 
Marsala, recent Breccia well seen. 
4. Castelvetrano. Quarries of Campo Bello. 
5. Sciacca. Ruins of Selinus on the way. Near Sciacca, Mount Calo- 
gero (Baths of Daedalus). 
6. Monte Allegro. Beds of selenite. 
7- Girgenti. Before leaving Monte Allegro visit the sulphur mines of 
Cattolica. 
From Girgenti travellers proceed, in general, along the coast to Alicata 
and Terranuova. I should recommend the following deviation, in order 
to obtain a knowledge of the structure of the interior of the island; 
1st day. Girgenti to Caltanisetta, by Macaluba (air Volcano) Aragona. (Sul- 
phur mines), &c. 
2. To Castrogiovanni, where the salt mines of Alimena are seen. Vale 
of Enna. 
3. Caltagirone. Bridge thrown over a chasm, 
4. Terranuova. Look for the junction of the blue-clay and tertiary 
limestone. 
Having regained the coast at Terranuova, proceed 
1st day. To Ragusa. (Bituminous rock.) 
2. Bachyno, near Cape Passero, seeing on the road, if possible, the V al- 
ley of Ipsica, curious for its artificial caverns. 
