NOME IV. TUFO. 407 



altered state. In one of the laminae are crystals 

 of prismatic schorl ; and in all the cavities is a 

 white fibrous radiating matter, which I conceive 

 to be asbestos in a changed condition, owing to 

 the action of fire. 



" It is found on the current of lava, at the foot 

 of the cone. 



" No. XII. A grey lava with earthy grains, La*a*. 

 which, notwithstanding, yields sparks with steel; 

 its base is composed of a great number of points 

 and laminae of felspar, with some crystals of 

 black vitreous and prismatic schorl, and a few 

 grains of greenish chrysolite ; this lava, on being 

 moistened, yields a smell like clay, as also do 

 the two following lavas. 



" It is a result of the lesser eruption towards 

 the south. 



" No. XIII. Compact lava, showing a vitreous 

 fracture, the base of which consists of small 

 shining points, resembling talc, mingled with 

 diminutive lamellae of white felspar, and some 

 chrysolites of a dull green colour : this specimen 

 was apparently fissile. 



" This proceeds from the same eruption. 



" No. XIV. A lava of a dark grey colour, of 

 he same species as the foregoing; it is of 

 r ougher grain, and the talc still preserving its 



