Vue generale de I'Isle de Volcano
Hoüel was very interested in the volcanic activity of the Lipari Islands. Volcano Island, illustrated in Plate LXII, is a group of pyramidal mountains formed by ash and lava. Rainwater erosion of the rock creates furrows seven or eight feet wide which are useful as paths for people and animals; their depth helps to protect from the sun and maintain a cool temperature during the summer. The volcano mouth often changes its location.
In the 18th century Volcano Island was a deserted place; a solitary man lived there with the particular job of protecting the sulphur from thieves.
In front of Volcano Island, Hoüel drew some men working at Lipari shore. They use the old technique of a plough pulled by oxen: the ploughman is followed by another worker who scatters the seeds. When next furrow is ploughed, the uplifted soil covers the seeds sown in the previous trench.
In illustration LXV the main mouth of Volcanello (A) occupies the highest part of the mountain. The lower mouth (B) is in the South. Above these two mouths we can see Lipari. On the horizon and to the left, appears Salina. This is the point from which Volcano Island has been illustrated in Plate LXII.
Hoüel was captivated by the beauty of the landscape, the descriptions of which are characteristic of an enlightened 18th century scholar.