126 Description of a Lake of Sulphuric Acid. 
that I had held out the expectation of finding coal to th¢, 
inhabitants of Exeter. I have not even distantly alluded to 
the subject. In every district, the lowest rock which rises 
to the surface in different parts may be considered as the 
fundamental rock, yiving the true geolegicai character to. 
that district, although this fundamental rock may be co- 
yvered in many parts with rocks of another class. , 
The district which Cuvier has described round Paris, is 
considered properly as a chalk district, though the chalk is 
covered in most parts by strata of a subsequent formation. 
Thus also in the alpine districts of England, which I have 
delineated, the sides of the primary or transition rocks are 
in some parts covered with coal strata: but this cannot 
change the geological character of the country, or invali- 
date the propriety of the terms primary or transition rocks, 
as applied to them in tracing on a great scale the geological 
features of the country. 
Yours, &c. 
Whitby, July 15, 1813. R. BAKEWELL. 
XXII. Description of a Lake of Sulphuric Acid at the Bot- 
tom of a Volcano of Mount Idienne, situated in the Pro- 
vince of Bagnia-Vangni, in the Eastern Part of the Island 
of Java. By M. Lescuenavcrt, Naturalist and Cir- 
cumnavigator in the Employment of the French Govern- 
anent™. 
Tue province of Bagnia-Vangni is the most eastern district 
in the island of Java; it is separated from the island of 
Bali by a streight about two leagues broad: its territory is 
formed of the declivity of Mount Idienne, which com- 
mands it on the west, and the immense base of which is 
covered with lofty forests. This country is one of the 
finest and most fertile in Java, but it is also the most insa- 
Jubrious. Within these forty years only it has been under 
the subjection of the Dutch: formerly it was governed by 
its own prince, who was driven from his throne by the 
Dutch, and died in retirement at Bali. Some time after 
the submission of this province, the inbabitants revolted 
on account of certain exactions imposed upon them by the 
Dutch ; but they were soon conquered and dispersed: their 
persecutors, however, almost all died of a contagious disease, 
*From Annales du Museum @ Histoire Naturelle, ix Année, tom. xviii. p. 495. 
+The annexation of Java to the British empire will,it is presumed, render 
this memoir doubly interesting to the English reader at present-—Enirt, 
‘and 
