Common Minerals and Rocks

Boston Society of Natural History
GUIDES FOR SCIENCE-TEACHING
No. XII
Common Minerals and Rocks
By WILLIAM O. CROSBY
D. C. HEATH & CO., PUBLISHERS
BOSTON NEW YORK CHICAGO
Copyright
By the Boston Society of Natural History
1881
I D 2
Minerals and rocks, or the inorganic portions of the earth, constitute the proper field or subject-matter of the science of Geology. Now the inorganic earth, like an animal or plant, may be and is studied in three quite distinct ways, giving rise to three great divisions of geology, which, as will be seen, correspond closely to the main divisions of Biology.