PREFACE vii 



S. Arrhenius : Immunochemistry, New York, 1907, 



The Macmillan Co. 



" Anwendungen der physikalischen Chemie in 



der Immunitatslehre," Zeitschrift fiir Chemo- 



therapie, vol. 3, p. 157, 1914. 



Hoppe - Seylers Zeitschrift fiir physiologische 



Chemie, vol. 63, p. 324, 1909. 

 Memoirs published in Meddelanden frdn K. 

 Svenska Vetenskapsakademiens Nobelinstitut, 

 vols. 1 and 2. 



Harriette Chick: " The Factors conditioning the 

 Velocity of Disinfection," Eighth Inter- 

 national Congress of Applied Chemistry, vol. 

 26, p. 167, 1912. 



Harriette Chick and Martin : Memoirs published 

 in Journal of Physiology, vols. 40, 43, and 

 45, 1910-1912. 



Madsen and his pupils : Memoirs in the Communi- 

 cations de rinstihit sdrothdrapique de I 'Etat 

 danois, 1907-19 13. 



In the hope that this little book will evoke 

 interest for the new discipline and stimulate con- 

 tinued work, I lay the results of my efforts before 

 the benevolent public. 



I must also express my thanks to Dr. E. N. da C. 

 Andrade for his valuable assistance in the prepara- 

 tion of this monograph. 



SVANTE ARRHENIUS. 



Stockholm, May 191 5. 



