vi PREFACE 



no attempt has been made to be exhaustive, only representative 

 methods being considered, the intention being above all to emphasize 

 the principles which are involved and to furnish an idea of the 

 general character of immunological technique. At the same time 

 it is hoped that the presentation of the subject matter will be found 

 sufficiently detailed to serve as a basis for treatment and as a 

 guide in the serological laboratory. 



C. E. S. 

 1734 LINDEN AVENUE, BALTIMORE, 1912. 



