of Mount Etna, in 1819. 233 



Note. — It will not, perhaps, be tedious to the reader, if I repeat what I have 

 before communicated to many of the philosophers of Europe, upon the 

 subject of the Electricity upon Etna: — On the 2nd of June, 1814, before 

 mid-day, two travellers were returning from the mountain, guided by Vicenzo 

 Carbonaro, one of my guides, from Nicolosi. They had arrived in the Piano 

 delLago, where, expecting a hail-storm, they quickened their pace, walking 

 upon the frozen snow. Carbonaro was the most advanced of the party, he 

 felt his hair stand an end, his forehead and the skin of his face felt benumbed, 

 and he heard a hissing noise. He took off his cap, and his hair became 

 more bristled, and the whistling noise more powerful. The traveller nearest 

 to Carbonaro also heard a humming sound, and asked the guide what it 

 was J he could not give him any reason for it, and he stopped, supposing 

 he was dizzy. In the mean time, they approached each other, and were 

 pleased with the magic sound. The traveller turned to call his companion, 

 who was at a like distance off, and made a sign to him with his hand ', 

 the hand, when raised, produced a much stronger sound ; so much so, that 

 moving the fingers singularly modulated it. The traveller approached, 

 and heard the sound produced by the head and body of his companion. He 

 wished to imitate his companion, but not having entered into the current of 

 electric air, his repeated attempts produced no sound. Finally, the three 

 persons having joined, they experienced great pleasure, as with moving their 

 lingers, they produced the above extraordinary effect. In the mean time, the 

 hail-storm fell on them, and being rather curious than erudite, they resolved 

 to prosecute their journey downwards, without caring to make further investi- 

 gations. Scarcely had they gone a few paces, going out of the electric air, 

 than the sounds ceased, and Carbonaro was relieved from his apprehensions. 



Description of Vie Plates. 



PtATB UI.— A COMPARATIVE CHART OF THE PERPENDICULAR 

 HEIGHT OF ETNA. 



11. Casa delli Rinazzi. 



12. Monti Rossi. 



13. Nicolosi. 



14. Monte Piliere. :^ 



15. Terre diGrifo. 

 ] 6. Mascaleia. 

 n.Plachi. 



18. Lava of 1669. 



19. Fasaro. 



20. Catania, 



Fig. 1. Gemmellaro's cottage. 



2. Philosopher's Tower. 



3. Plain of the Lake. 



4. Rock of the Lake. 



5. Tempa del Barile. 



6. Montagnuola. 



7. Uninvestigated region. 



8. Mount Castellacci. 



9. Termination of the woody 



region. 

 10. English Giotto. 



