IV PREFACE. 



forward has not been assumed to account for a particu- 

 lar phenomenon, but has been established by the facts, 

 and proved by several years' experience, so that its ap- 

 plication will enable a person to predict the general 

 nature of the crystalline rocks, metalliferous deposits, 

 and dislocations of any mining district. With regard to 

 the other points which the above principle leads to, 

 there is no doubt they will be opposed by theoretical 

 persons ; however, this cannot interfere with the prac- 

 tical operations of the mining engineer ; he may safely 

 trust to the laws of terrestrial physics, and leave time to 

 prov T e which has the best foundation. In conclusion, the 

 Author hopes that his humble endeavours, combined 

 with the local knowledge of practical men, will lead to 

 new discoveries, avoid so much " guess-ivork " and un- 

 profitable undertakings, and thus tend to render this 

 branch of our national wealth more certain and prospe- 

 rous than it has hitherto been. 



February 1, 1844. 



