x PREFACE 
It seemed desirable that the reader should be spared an 
undue amount of repetition, and for this reason a number 
of publications are omitted from this collection, and those 
printed are in many cases shortened. Among the papers 
which have been omitted are the preliminary notices and all 
those papers of which I am not the sole author. Occasion- 
ally I have made additions in the form of footnotes. Such 
footnotes have always been marked by the addition of [1903] 
at the end. 
Only a small number of these papers appeared originally 
in English, namely, VII, XXI, XXVI-XXXV, and XXXVII. 
The other papers were translated from the German by Pro- 
fessor Martin H. Fischer, to whom I wish to express my 
sincere thanks. The credit as well as the responsibility for 
the translation belongs entirely to him. In the reading of 
the proof I was assisted by Dr. Fischer, Dr. Rogers, Dr. 
Bullot, and Dr. Bancroft. Mr. Rogers made the index for 
the first volume. To all these gentlemen my thanks are due. 
Jacques LoEs. 
BERKELEY, CALIFORNIA, 
October 14, 1904. 
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