s* 



>>OH^ 





NOTE. 



The Second Part and concluding portion of this work will be published in a few 

 months. It will contain a general discussion of the whole subject of the Auriferous 

 Gravels, especially with reference to the physical conditions having to do with their for- 

 mation ; also a description and discussion of the glacial phenomena of the Pacific coast, 

 and of North America generally. It is expected, also, that additional information in 

 regard to the most recent developments of the hydraulic mining industry in California 



will be added. 



J. D. W 



Cambridge, Mass., March 31, 1879. 



Notice to the Binder.— On the completion of this volume, a new Title-Page, Table of Contents, 

 and Index for the whole work will be furnished : those issued with the present part (Vol. VI., No. 1, 

 Part I.) must be cancelled when the volume is bound. 



