NOME IV. TUFO. 4Q 1 



feet ; I found a similar block projected the dis- 

 tance of three miles, its diameter one way was 

 eight, the other four feet ; its prodigious weight 

 had occasioned it to bury itself almost entirely 

 in the drosses, and its surface alone was visible. 

 " Pieces of such great bulk are not numerous $ 

 but it is impossible to calculate the immense 

 quantity of light and heavy drosses, which, at 

 various elevations, cover the cone itself, and the 

 country for several miles around; and which, 

 during the most violent part of the eruption, fell 

 in the form of rain. The streams of solid Java 

 added together would form a solid mass, includ- 

 ing interstices between the parted streams, of 

 6,218,661,276 cubic feet. 



" PRODUCTION OF THE ERUPTIONS OF THE 

 MONTH OF JULY, 1787- 



" I have minutely examined the productions 

 f this eruption, which may be reduced to the 

 bllowing varieties. 



" No. I. The first rain of volcanic matter, at Drosses and 



. , , r ,, powders. 



irst sight, appeared to consist or a yellowish 

 )uzzolana, such as is found near the craters of 

 ^olcanoes, after their having been long extinct ; 

 t is composed of pieces from the size of dice 

 VOL. IT. 2 D 



