NOME IX. SUBSTANCES EJECTED OR CHANGED. 



intend shortly to make them public, by having 

 them engraved, and to give the explanations of 

 those which have relations with known species." 



HYPONOME I. VOLCANIC BRICIA. 



The various kinds are already mentioned. 



Micronome 1. Peperino. 



From the environs of Vesuvius, &c.* 



Micronome 2. Leucite Lava. 

 From Vesuvius, Albano, &c. 



NOME IX. SUBSTANCES EJECTED OR 

 CHANGED. 



Many kinds of rocks are at various periods 

 ejected by volcanoes; often with some marks of 

 fusion, but in many instances, exploded by the 

 vapours, without being visibly affected by heat. 

 Whole masses of rock, nay mountains, are also 

 found changed by the action of the subterranean 

 vapours, as the celebrated Puy-de-Dome, which, Puy-de-Dome, 

 according to Saussure 728, 729, is a porphyry 

 with a base of earthy felspar ; and he found one 

 of the same kind in the Valofsine. Mont Dor 



* Monte Nuovo near Naples, consists of indurated powder, pu- 

 mice, and fragments of lava intermingled, forming a peperino. 



