Mineralogy and Geology. «433 
of those little cones of eruption whose activity and play recall exactly 
' under another form the hornitos of Malpays. Their temperature va- 
nds by gyp- 
the lagoons 
common to see towards the limits where the metamorphic influ- 
sum, by con- 
rich waters had 
Szoonp Series, Vol. IX, No. 27.—May, 1850. 55 
ma 
