See a Se 
On the Vents of Hot Vapor in Tuscany. 211 
point, therefore, for which I contend is, that the amorphous. and 
spheroidal ‘‘ gabbro rosso’’ of the Tuscans is from its composition, 
and still more from the geological part it has played, a true plutonic 
and eruptive rock ; whilst the red jaspidified schists, which have 
been also termed “ gabbro,” are nothing more than sedimentary 
strata altered by the heat attending the eruption of the adjacent 
masses. 
Lines of former and present disturbance.—As it is along the 
lines of eruption of the serpentines, greenstones and gabbro, 
zt. e. from N. by W. to S. by E., that nature has been repeat- 
edly laboring to evolve heat in the west of Tuscany, so also have 
hills with radii; the centre or box of each wheel-shaped body 
being composed of concentrically laminated sands, marking the 
i css sclinle secede 
mo Pilla, and the Italian authors show that the granite of Piombino and 
cuts through ine. 
e serpent 
