vi PREFACE. 



evenings after a hard day's work in the open air, or of early hours stolen 

 from the morning before the regular labours of the day began. 



It only now remains for the author to express his grateful thanks to his 

 friends, Mr. Robert Hunt (Keeper of Mining Records), and, especially, 

 to Mr. Warington Smyth, for their valuable aid in revising the proofs in 

 passing through the press, and for enabling him to avoid many errors, 

 which, but for their advice, would otherwise unavoidably have occurred. 



The figures of crystals have all been carefully drawn on the wood by Mr. 

 J. B. Jordan of the Mining Record Office, and the whole of the wood-cuts 

 have been executed by Mr. S. J. Mackie. For the tail-piece the author is 

 indebted to Miss Kennedy, by whom it was drawn on the wood ; and for the 

 following jeu d'esprit to his colleague, Mr. J. W. Salter, of the Geological 

 Survey. 



1st September, 1861. HENRY W. BRISTOW. 



eS0*PA2T02 nEPI TON AieON 



