In the preparation of this thesis the following works have been 

 freely consulted: 



Practical Assaying, Furman. 



Assay Notes, Colorado School of Mines. 



The Mineral Industry. 



Journal of the Chemical and Metallurgical Society of 



South Africa. 

 The Engineering and Mining Journal. 

 Journal of the American Chemical Society. 

 Papers of the Institute of Mining and Metallurgy. 



Due credit is given under each note when taken from any of 

 the above-mentioned sources. 



In the lead and copper smelting notes, and in some of the 

 cyanide notes, the methods given have been in almost daily use 

 by the author of this thesis for some time. All the methods given 

 under lead and copper smelting have been checked, and are known 

 to be accurate. 



My thanks are due to Dr. John B. Ekeley, under whose direc- 

 tion this work was undertaken; Dr. C. S. Palmer, Mr. Philip Argall, 

 Mr. E. M. Johnson and Mr. Barry Hogarty, for valuable help and 

 for my laboratory training. 



