[ 4^3 3 
.Raui% efpecially in Thunder ^ Showers , which ^ire the 
Riofthafty, the Water is precipitated with great Vio- 
lence down the fteep Valleys, in which are the Channels 
of thefe Rtvuktsi lb that the Water in this Lake, being 
cncreafed by the fiddain coming in of the Rains fafter 
than it can empty, fvvells prefently : and finding feveral 
Hoies. or Caverns in the Mountain higher than its ordina- 
ty fiirface, it runs over by them both into the SubtefranC'- 
tes Like under that Q&Girknit^f( into which the Water 
tomes up by the ieveral Hoks or Pitts in the Bottom there- 
of) as iiksw-ife by vifibia Plffages above- grdund, fuch 
as VrdmjmmUj Sekddul^^efhnd Trefenz. 
That Idme of thefe Pailageg^ bring F/^^ ijovm t)mh 
and Fijh^ others only Water, feems to depend on the pc> 
fition of the in ward Mouths of thefe Subterraneoiis Chan- 
nels \ for if they be fo conftituted, as to draw off the Wa- 
ter from the furface of the upper Lake, on which the 
D^cfoRvim,, they muft needs be drawn away by the 
Stream into thele Caverns, and coffle out with the Wa* 
ter : But if ib be that the Channels open, into the upper 
Lake, under the furface of the Water, and from thence 
afcend obliquely for fome fpace, before they come td de- 
fcend ; then the Water they carry is drawn from below 
the furface, and confequently can bring with it no Drnks^ 
but only Fifhe Thoie Pitts which yield only Water, may 
well be fuppofed to be fed by paflages too narrow to let 
the Fijb pail, tho'' their multitude may make the quantity 
of Water they emit to be very confiderable. 
The Manner of the falling away of the Water or emp- 
tying of the Lake, I thus explain. After a long drought 
or want of Rain, all the Springs that feed the upper Lake 
under Javormk^LVt much dimini&ed; fo that wanting frefli 
fupplies, it ceafes to run over by the fe vera 1 Channels, 
but now mentioned : hence die Lake of ZJrkmtz^ ^nd 
that under it, are fed only by the eight Rivulets that aL 
wais fail into them ; and then the Water dra\ys off fafter 
- . Kkk 3 tlvM 
