on EXTINCT VOLCANOES, l4l 



confirmed me in this opinion. Though divided into fevef^l fj^^jJ^'frcM"* 

 parts, which do not perfedly correfpond with each other, that the caft ; but a- 

 on the weft perfe6lly reprefented a fegment of a vaft crater in bounds with la- 

 good prefervation. Standing on the border of this fegment, i^^i, 

 I obferv'cd on the eaft, at the diftance of half a league, quar- ^^s fummit onco 

 ries of lava, of which this mountain was the fource. The jjut partly dc- 

 gully I have mentioned feemed to militate againft the adoption ftroyed. 

 of fuch an opinion with refpe^t to the quarries of Medermenich, thar"oceeded 

 which are to the nor th-eaft beyond thefe: but time, and the from it. 



various circumftances, that have formed fifteen feet depth of '?:%P'*"^^Hy*''* 

 , , , n . . ■ • r , . ^^^^^ of Meder- 



mould, may have occationed the apparent mterruption of this menich. 



current of lava. I do not doubt however, but feveral of the ^^^ feveral of 



neighbouring mountains have been openings of volcanoes. jng mountains' 



From the fummit of Blemberg I enjoyed a grand and very ^^^e once toI- 

 extenfive profped. On the fouth 1 bad the little town ofpr"^g*^£j,^j^ 

 Mayerne, on the north Medermenich, and Ettringen on the Blemberg fine, 

 weft. 



I quitted this mountain tovifit that of Zimmeray, about half Village of Et- 



a league weft of it, and I pafTed through the villas^e of Ettrin- J'-'ngen built of 

 \ .,,.,, ^ '. ^ ^ lava and rcorice. 



gen, built ot lava and icorioe. 



Tiie whole of the body of the mountain of Zimmeray is The mountain 

 volcanic. The lavas there are in a ftate of torretkaion, ihditlii^^^^'^^ 

 announces the exiftence of a crater. ' In fa6t, when I reached Its fummit a 

 its fummit, I there found all the marks of one. It is of a*^"^*^^* 

 conical form, and has a hollow opening to the fouth. The 

 fides of this hollow facing the fouth are well preferved ; thofe 

 that face the north have been deftroyed. I imagine this took 

 place at the period of the laft eruption, and that a ftream of 

 lava would be found by digging on that fide. 



I then left this mountain, and proceeded to that of Calberg, Mount Calberg 

 which is on the north, and feparated from it only by a tolerably cc'^tains trapp. 

 broad valley, in which I found trapp, of a blackilh gray co- 

 lour, in mafs, and in fcattered blocks. At the foot of mount At its foot a 

 Calberg was a bed of black, coarfe grained, volcanic fand, ^^'^°^ volcanit 

 firatiform, and containing a great deal of mica in large leaves, containing, mica 

 The trees that covered its fummit prevented me from afcertain- '^ ^^ge leaves, 

 ing its nature, but the circumference of its bafe is entirely n^ i,afe entirely 

 volcanic. Around it is muddy lava, in which larger or fmaller volcanic. 

 fragments of compa^ lava occur. Gray clay predominates Gray clay pre- 

 ihoie dominates* 



Q I had 



