2-04 TRAVELS THROUGH 



3. A deep-'.j iwn unfpotted tufo, unmixed, ex- 

 cept with forae lamelles of black-green fherl 

 glimmer. 



4. The common building-tufo, compofed of 

 fragments of grey-yellow brown, greeniffr and 

 deep-brown tufo, black fherl-grains, and white 

 calcined farinaceous garnet-like cryftals or round 

 fpots, more or lefs fermenting with acids. The 

 whole mixture of this tufo fomewhat affected 

 by aqua fords. Some years ago they found in 

 this monte-verde tufo a large bone, which was 

 considered as a tooth of a cacholong, and is de- 

 fcribed by P. Jacquier in an Italian magazine ; 

 but its length of four or five feet did not agree 

 with that denomination. It was rather a bone or 

 tufk of an elephant, brought there by accident, 

 and covered in afhes by a pofterior eruption of the 

 adjacent volcano. The round pebbles fometimes 

 inclofed in this tufo may have been brought there 

 by fimilar accidents, or rolled from higher grounds; 

 which is the more probable, as near Fiumicino 

 there are hills of ferruminated pebbles or a coarfe 

 krcctia, 



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