85 



terisiert sein, dass sie sich prinzipiell von den Tröpfchen der mikro- 

 skopischen Emulsionen unterscheiden". 



It was a long time before Beijerinck's observations found the 

 appreciation in colloid chemistry which they merited, but in later 

 years this appreciation was shown. In 1911 Tiebackx ') described 

 a new example of. the phenomenon as observed by Beijerinck; in 

 1927 Wo. OsTWALD and Köhlerz) devoted a study to another 

 instance, and in 1929 Bungenberg de Jong and Kruyt 3) added a 

 number of cases, and gave the name of coacervation to the phe- 

 nomenon. Since then it has become of increasing importance in 

 colloid chemistry. 



If one examines the present conception as to the nature of "co- 

 acervation" (see, for instance, the figure on page 202 of H. R. Kruyt 

 andH. S. van Klooster "CoUoids" ^)), it will be apparent that Beije- 

 rinck's conception of a difference between colloidal particles and 

 suspended droplets has been justified. 



1) F. W. Tiebackx, Gleichzeitige Ausflockung zweier KoUoide, Kolloid-Zeitschrift 

 8, 198-201, 1911. 



2) Wo. OsTWALD und R. Köhler. Über die flüssig-flüssige Entmischung von 

 Gelatine durch Sulfosalizvlsaure und über die Beziehungen dieses Systems zur Pha- 

 senregel, KoUoid-Zeitschfift 43, 131-150, 1927. 



3) H. G. Bungenberg de Jong and H. R. Kruyt, Coacervation (Partial misci- 

 bility in colloid systems), Proceedings of the Section of Sciences, Kon. Akad. v. We- 

 tenschappen Ams'terdam 32, 849-856, 1929. 



*) Second Edition, New York 1930. 



