VI PRINCIPLES OF CHEMISTRY 



illustrations, as electro-types of the figures in the original could 

 not be obtained. 



Since the publication of the Russian fifth edition, Professor 

 Mendeleeff has issued some appendices to the work, which will be 

 found printed at the end of Volume II. We have to express our 

 thanks to the Managers of the Royal Institution for permission to 

 reprint the lecture delivered at the Royal Institution by Professor 

 Mendeleeff (Appendix I.), and to the Council of the Chemical 

 Society for permission to reprint the Faraday lecture which forms 

 Appendix II. 



In conclusion, we would express our gratitude to Professor 

 Kinch for the aid so kindly given in revising the sheets for 

 the press. 



G. K. 

 A. J. G. 



October, 1891. 



