CONTENTS. 
GENERAL OrEoGcRapHY—( Continued.) 
19. Improvement of organic forms with the 
earth, 
20. Relation of paleontology to geloey, 
21. Object of geology, 
IV. Special Oreography, 
Normal rocks, . : ‘ : 
Bottom series, - 4 
Middle series, : 
Primary middle, or drbicore rock, 
Secondary middle series, 
Tertiary middle series, 
Top series, 
increasing age 
of the 
A, Masses which fave Scperelcedk no ae change a position, 
&. Formations produced under the influence of running or of stand- 
Ing water, 
C. Masts which have arisen Gite chi arin the deledinsitadtion or 
destruction of rocks, . 
D. Masses which have experienced a ghaibe of oibsiaal sitiatsch, 
. Common earth, 
Springs and artesian wells, . : 
Influence of water upon rocks, - 
Abnormal rock masses, . ; . 
1. Plutonic rocks, . y : 
A. Granite rocks, . : ° 
B. Syenite rocks, . ; ° 
C. Porphyry rocks, ° ° 
D. Amphibolic rocks, ° ° 
H. Pyroxene rocks, : ° 
2. Voleanoid rocks, . : 2 
A. Trachyte, : ° 
B. Phonolite (Giiststone);: : 
C. Basalt, : : - 
3. Volcanic rocks, . : 
V. The Surface of the Earth in perce : 
