TRANSLATOR'S PREFACE 



HAVING found the first edition of this book of great use, I 

 have willingly undertaken the preparation of an English 

 translation of this greatly enlarged and improved second 

 edition. I have embodied in it all the additional matter 

 contained in the Addenda to the German text, as also 

 certain modifications and additions communicated to me by 

 Professor Meyer, who, by reading the proofs, has ensured 

 their accuracy. 



It has been no part of my intention to add any com- 

 mentary upon the book, but I have appended a few foot- 

 notes that seemed advisable, and I have added an Index 

 which I hope will prove useful. 



KOBEKT E. BAYNES 



OXFORD : October 1899 



Addenda and Corrigenda 



P. 46, 1. 13 : Add Planck (Miinchener Sitzungsber. 1894, xxiv. p. 391 ; Wied. 

 Ann. 1895, Iv. p. 220) has attempted to meet Boltzmann's 

 objection (see also Wied. Ann. 1894, liii. p. 955) by a change 

 in the form of Kirchhoff's proof, but Boltzmann 

 (Munch. Sitzungsber. 1895, xxv. p. 25 ; Wied. Ann. 1895, 

 Iv. p. 223) considers that even this amended proof is not 

 perfect. See Phys. Soc. Abstracts, 1895, i. pp. 96, 313. 



,, 106, 4th formula : For = read a p = a. 



139, 1. 21 : For Staigmuller read Staigmiiller. 



,, 232, formula for t\ : Add the exponent f after . 



