4.32 CONTENTSTOF THE

by injetion from without; coralloids converted to flint z French miliſtones; Bints ſometimes found in ſolid ſtrata. 7. Angles of ſand deſtroyed by attrition and ſolution in ſteam; ſiliceous breccia cemented by ſolution in red-hot water. 08. Ba/altes and granites are antient lavas; baſaltes raiſed by its congelation not by ſubterraneous fire,

NOT DWS ZELANV

Fra and water two great agents; ſtratification from precipitation; many Rratified materials not ſoluble in wa- ter. 1. Stratification of lava from ſucceſſive accumula- tion. 2. Stratifications of limeſtone from the different periods of time in which the ſhells were depoſited. 3. Stra- Ufcations of Coal, and clay, and ſand-ſone, and iron-ores, not from currents of water, but from the produttion of moraß-beds at different periods of time; moraſs-beds become ignited; their bitumen and ſülphur 15 ſüblimed; the clay, lime, and iron remain; whence ſand, marl, coal, white clay in valleys, and gravel-beds, and ſome ochres, and ſome calcareous depoſitions owing to alluviation;

clay from decompoſed granite; from the lava of Veſn-

viusz; from vitreous lavas«.

NoTE XX[.--ENAMELS«.

RosE-CoLOUR and purple from gold; precipitates of gold by alkaline falt preferable to thoſe by tin; aurum fulminans long ground 3; tender colours from gold or iron not diſlolved but ſuſpended in the glaſs; cobalts; calces of cobalt and copper require a ſtrong fire; Ka-o-lin and Pe-tun-tſe the ſame as our own materials,

aas pus, 3