AUTHOR'S PREFACE 



THE small volume of which Part I. is here presented has 

 been developed from lectures delivered in the winter term 

 of 1912-13. It by no means exhausts the materials of the 

 colloid chemistry of the proteins even up to that date. 



In response to many requests, it is proposed to collect in 

 perspective the investigations carried out by the author and 

 his co-workers in the course of many years, prominence being 

 given to the most important results. Such fundamental work 

 of other authors as is relevant has also been included in an 

 attempt to round off the presentation, but for complete data 

 the reader is referred to the well-known works of O. Cohnheim, 

 R. H. A. Plimmer (translated into German by J. Matula), and 

 T. B. Robertson. 



The second part, to appear within a year, will include the 

 relations of the proteins to neutral salts and to the salts of the 

 heavy metals, to colloids and to ampholytes, the properties of 

 the albumin gels, and, finally, the physical chemistry of the 

 purest albumin so far prepared. 



I take this opportunity of thanking most heartily Dr. Mona 

 Adolf for her careful and critical reading of the proofs, and also- 

 my assistant and collaborator of many years, Dr. Joh. Matula, 

 for drawing the figures. 



WOLFGANG PAULI. 

 VIENNA. 



