IV PREFACE 



and organic, and to the various processes of the laboratory. 

 These are followed by a collection of extracts from the writings 

 of noted German chemists, having in many cases direct bearing 

 upon the history of chemistry. A vocabulary of the more 

 common German terms used in Chemistry will aid the student 

 in his translations. The work is intended for students who have 

 had at least a year of German and who have mastered the elements 

 of chemistry. 



For permission to include in this volume a number of extracts 

 from German published works I have to express my thanks to the 

 following authors : Dr. J. Berendes in Goslar ; Dr. Albert 

 Ladenburg, Professor in the University of Breslau ; Dr. Joachim 

 Biehringer, Professor in the Polytechnic School in Darmstadt; 

 Dr. O. Wallach, Professor in the University of Gottingen; Dr. 

 Karl Engler, Professor in the Polytechnic School in Karlsruhe; 

 Dr. Karl Elbs, Professor in the University of Giessen; Dr. H. 

 von Brunck in Ludwigshaf en ; Dr. Wilhelm Vaubel, chemist in 

 Darmstadt; Dr. H. Nissenson, chemist in Stolberg; Dr. Julius 

 Ephraim, Patent Attorney in Berlin; Dr. Fritz Glaser, Chemist 

 in Mainz ; Dr. E. Rimbach, Professor in the University of Bonn ; 

 Dr. Fritz Eisner in Leipzig; Dr. J. H. Vogel, Professor in the 

 University of Berlin; Dr. Gustav Schultz, Professor in the Poly- 

 technic School in Munich ; Dr. Wilhelm Schule, Professor in the 

 Polytechnic School in Breslau; Dr. H. Daneel, Professor in the 

 Polytechnic School in Aachen; Dr. Otto N. Witt in Berlin, 

 President and Dr. George Pulvermacher in Berlin, Secretary of 

 the Fifth International Congress of Applied Chemistry; Dr. 

 W. Wien, Professor in the University of Wiirzburg, Editor of 

 the Annalen der Physik; Dr. Paul Jacobson, Professor in the 

 University of Berlin, Editor of the Berichte der deutschen 

 chemischen Gesellschaft; Dr. J. Thiele, Editor of the Annalen 

 der Chemie. 



My acknowledgments are due also to the following publishers 

 for a like permission : Tausch and Grosse, Halle a/S ; Friedrich 

 Vieweg und Sohn, Braunschweig; R. Oldenbourg, Munich; 

 Wilhelm Engelmann, Leipzig; Veit und Cie, Leipzig; Johann 



