Labrador feldspar, ejected.
Lakes at bases of volcanoes.
Lamination of volcanic rocks.
Land-shells, extinct, at St. Helena.
Lanzarote, calcareous beds of.
Lava, adhesion to sides of a gorge. -feldspathic. -with cells semi-amygdaloidal.
Lavas, specific gravity of.
Lava-streams blending together at St. Jago. -composition of surface of. -differences in the state of their surfaces. -extreme thinness of. -heaved up into hillocks at the Galapagos archipelago. -their fluidity. -with irregular hummocks at Ascension.
Lead, separation from silver.
Lesson, M., on craters at Ascension.