

BPREPACE TO .THE FIRST EDITION 
Tuts Handbook addresses itself, in the first place, to beginners 
in Field Geology, but I hope it may be found useful also to 
students who are preparing for professions in which some 
knowledge of Structural Geology is of practical importance. 
The amount of geological training demanded varies, doubt- 
less, with the nature of the profession. Mining engineers, 
for example, must acquire a knowledge of many details 
which civil engineers, architects, agriculturists, and public 
health officers can afford to neglect. Nevertheless, if 
Structural Geology is to be of service to a professional man 
it must be studied in a systematic manner. Without an 
intelligent appreciation of the subject as a whole, it is very 
hard or well-nigh impossible to gain an adequate working 
knowledge of any particular part. In the following pages, 
therefore, the subject is set forth mainly from the point of 
view of pure science. The student of applied science, 
however, should have little difficulty in distinguishing between 
matter of general interest, and that which is of special 
importance to him, as bearing directly on his own professional 
pursuits. To help in this discrimination two sizes of type 
have been employed—the smaller type being commonly 
reserved for details or discussions of import mainly or 
exclusively to students of pure science. With regard to the 
matter in larger type, the intelligent student will use his own 
discretion. To others than mining men, for example, the 
chapters dealing with ore-formations will not call for much 
studious consideration. Again, neither civil engineers, public 
health officers, nor agriculturists may ever be called upon to 
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