GEOLOGY. 



A. EARTHS. 



572. The proper organs of the planet are the mineral 

 aggregates or rocks. These are either presented to us 

 as they have originally been precipitated from water by 

 chemical process, or as they have been changed by the 

 co-operation of the other elements. There are thus 

 genetic and metamorphosed kinds of rock. The former 

 were crystallized previous to the current of the water 

 Primary rocks. These rocks are changed either 



1. By water Transition-rocks, or 



2. By air Trappean-rocks. 



3. By fire Volcanic -rocks. 



There are properly four kinds of rock formations 



1. Earth-formation, masses that have originated through the crystal- 



lizing force of the earth-element itself Primary-rocks. 



2. Aqueous-formation Transition-rocks. 



3. Aerial-formation Trappean-rocks. 



4. Igneous-formation Volcanic-rocks. 



The stratified rocks, having originated for the most 

 part mechanically, are only the object of Physio-philo- 

 sophy, in so far as chemical precipitations partly occur 

 amongst them. 



573. The earth-formation is represented by the crys- 

 tallized primary rocks. 



, a. Earth-Formation. 



574. The earths can only be precipitations from the 

 element that immediately precedes them, and thus from 

 water. They have been enveloped in the water, as this 

 has been in the air, and the latter again in the aether, 

 but not mechanically, as we at present dissolve clay in 

 water, nor chemically either, as lime dissolves by corrosion 

 in water, but dynamically. The water did not exist 

 from the beginning as water in the air, but only its 

 principles, which became for the first time water, when 

 they had combined by electricity. 



575. Even so was it the case with the earths. The 



