EDITOR'S PREFACE. ix 



less than his example, have stimulated others to follow in his 

 track, and to build upon the solid basis that he has left them. 

 Even the very periodical that he commenced so shortly before 

 his death is still conducted (under a different title) by an able 

 chemist, and is producing results worthy of its original founder. 

 I gladly avail myself of this opportunity of expressing my 

 obligations to the Council of the Sydenham Society for the 

 promptitude with which they accepted my suggestion respecting 

 the expediency of publishing an English edition of this work, 

 and for intrusting me with the editorship of it ; to one of that 

 body, Mr. Ancell, I am very deeply indebted for the kind and 

 valuable assistance that he has afforded me in the preparation 

 of this volume for the press. Amongst the many other friends 

 to whom my acknowledgments are due, I must especially men- 

 tion Dr. Allen Thomson, Dr. Percy, Dr. Wright, and Dr. 

 Golding Bird. 



G. E. D. 



Southwick street, Hyde Park. 



