NOTE. 



In the new edition of the American translation of my 

 hand-book a number of additions and changes have been 

 made by the translator with my permission. It is there- 

 fore reasonable that I should not take the same responsibility 

 for the translation as for the text of the German original, 

 and I would ask those of my colleagues who wish to question 

 the correctness of my assertions in their papers, to convince 

 themselves, by making comparisons with my last German 

 edition, that the paragraphs in question were written by me. 



PHILIPP STOHR. 



