Vis 25 
‘ Cia 
_ G. P. Scrope on Craters, and the Liquidity of Lavas. 347 | 
late t » amend them, ——— accounts for the different recep- 
ese two works met with from beth pe: the time, 
the volcanic remains of — Troe had some —_ in the 
final er gm of that German romance,—which some geolo- 
gists as old a myself may acre to have eas gpa 
oa in the Tight of a gospel-truth, and defended with great 
theories. And, as these disputed questions have an important 
ing on some of the most interesting problems of geology, I 
trust it May not be unprofitable to call the attention of our Soci- 
ety to the more prominent among them 
~ I will advert on this occasion to two subjects especially, viz 
7 
; The origin, or mode of formation, of voleanic cones ‘ad 
The nature of the liquidity of live at the time of its pro- 
ce ie from a voleanic ghia 
that 0 of the external more or less conical hill or mountain whi 
8enerally, but not always, environs . crater, and which, ee & 
often occurs without a crater, but always characterized by the € 
qua-qua-versal dip of its constituent of lava and conglom- me % 
,—to the accumulation round and above an eruptive vent, = 4 
ae Tragmentary ejections. and the lava streams poured o out “a 
* 
T considered this law to be withon’ exception ; attributing the 
differences in figure and structure apparent among volo —_. 
to the greater or less number and j violence of the : 
which they were owing,—some g the pr pe of as 
‘ruption, others of a vast number, often repeated through a series 
-8ges,—to differences in the position of the orifices oa pas 
°y atin, from ne summit of the cone, or its base, or an 
Se OU ERS IM 
Se Bite, Mikes Bete one 
