Sitti, Bibliografia generale per la scoria parmense (Parma, 1904); much information will be found in A.
- Luigi Cibrario, Scoria della monarchia di Savoia (Turin, 1840), for the early history; E.
The earth surface above these natural furnaces has been hardened, cracked and sometimes melted into a reddish slag, called scoria, which, on account of its resemblance to lava, has given rise to an incorrect impression that the region was once the centre of volcanic disturbances.
According to an account of the natives, a violent eruption of Kilauea occurred in 1789, or about that time, and deposits of volcanic sand, large stones, sponge-like scoria (pumice) and ashes for miles around are evidence of such an eruption.
Manzoni, Scoria della colonna infame), and he was sometimes guilty of unblushing plagiarism.
Between 1849 and 1850 he published his Scoria degli Italiani (Turin, 1855) and many other works.