the borders o f feveral ftrata, that feemed to defcribe arches o f a
circle with the extremities turned upwards. This phenomenon
was flill more complicated at Tapolye, where not only one order
o f arches appears, but frequently two defcribed one above
the other upon the fame bale; and they are reunited at their
internal extremities, ibmething like a houfe top, pointed or horned
as it were, after the Ohinefe manner. The reft o f the
mountain is all disjointed ; and the bed o f the cafcade is uneven,
craggy, and ruinous. The waters o f the Kerka iffue out below
from a dark cavern in great abundance. I was tempted to
explore this cavern, and accordingly got into a little boat,
fomewhat like an American canoe, provided with lighted chips
o f pine, accompanied by my friend Mr. Hervey. We were
not wholly unfuccefsfiil, though we had great difficulty to
defend ourfelves: from the tartarous protuberances o f the vault,
and to pulh forward againft the current; our lights were foon
extinguilhed, by the quantity o f little drops, which conftantly
fell from the rocks above; and advancing to a place, where the
river fall's with great noife, through a narrow and fleep channel,
we found our boat to be in danger of overfetting, by taking in
too much watter. We retreated, and advanced more than once;
and I make no doubt, that, had our boat been better contrived,
and fitted out for the purpofe, we fhould have proceeded much
further, and, perhaps, have been able to walk on the fubterra-
neous banks o f the river. It is to be remarked, that the mountains
of Tapolye make a part o f the fame marble chain, as thofe
o f Jarebiza, from whence the river Cettiha iffues in an oppofite
diredtion. There are corn mills on the Kerka, at a very little
diftance from its fource ; the wheels are placed horizontally,
and the radii lhaped like fpoons. Thefe kind o f wheels, which
are very convenient where there is little water,, may be feen among
the
the machines defcribed by the bilhop Taujlo Veranzh o f Se-
benico.
O f the V u l c a n i c H i l l s , which lie between ’T a p o l y e and
K n i n .
The diftance from Tapolye to Knin is five miles, either by
land or water. In travelling along the heights, I faw many
ruinous malíes, and confiderable traéis o f gravelly breccia. From
thence, defcending along the river, after a fecond vifit to the
cafcade, we flopped at two little bills, oppofite to each other;
the one o f common marble, and gravel hardened into breccia,
the other moftly vulcanic. The laft, called CapituI, merits ob-
fervation, on account o f the great variety o f vulcanic matter
contained in it. Amongft other kinds, there is a very light whitiih
ftone, with a mixture o f yellow mica, manifeftly produced
by fubterraneous fire, and which, though not perforated, I think,
may be named a -micaceous kind o f pumice ftone, confidering its
porofity, lightneis, and vulcanic origin. Examined with thè
microfcope, it appears compofed o f fmall vitrefcent femifluxedfand,
and feems to confili of the fame principles, as an excellent fort
o f tripoli, o f which I found a vein at the bottom o f the fame
hill. There are alfo ferruginous fcorik, black and porous ; fand
ilones, both red and yellow ; a kind of arenaceous breccia, o f a
violet coloured ground, fpotted with white ; a fpecies of micaceous
fiate;* heaps of pozzolana, o f a reddilh colour, confolidated
* Mica fquamofa alba. W a lk feet. 74 .3 ,
Mica fquamofa, rigidula, argentata. Linn. 58. 3.
Mica compaaa, mernbranis fquamofts, argentea. Wolterfdorff. min. 17.