41 8 THE COLLOIDAL STATE 



Further, the fact that at their isoelectric points colloids 

 are more easily precipitated, would suggest a possible harmful 

 consequence of an alteration of the hydrogen ion concentra- 

 tion of the cell sap in a direction towards the isoelectric point 

 in view of the increased Hkelihood of the salts present exerting 

 their precipitating action (see p. 437). 



FURTHER REFERENCES. 



Catalysis. 



Bodlander : " Ueber langsame Verbrennung," " Samml. chem. u. 

 chem. techn. Vortrage," Stuttgart, 1898. 



Bredig : " Kontakt Chemie u. Lehre v. d. Katalyse u. Enzymwirkung, " 

 from " Handbuch d. angew. phys. Chemie," Leipzig, 1905. 



Simon : " La Catalyse," " Bull. Soc. Chim.," Paris, 1903, [3], 29, i-xx. 



Colloids. 



British Association : " Reports on Colloid Chemistry," London, 1917 

 and 1918. 



Bredig: " Anorganische Fermente. Darst. koUoidaler Metalle, etc.," 

 Leipzig, 1 90 1. 



Freundlich : " Kapillarchemie, eine Darstellung d. Chemie d. KoUoide, 

 etc.," Leipzig, 1923. 



FreundUch: "The Elements of Colloidal Chemistry." Trans, by 

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Handovsky : " Fortschritte in d. Kolloidchemie d. Eiweisskorper," 

 Dresden, 191 1. 



Hatschek : " The Physics and Chemistry of Colloids," London, 1919- 



Hatschek : " Laboratory Manual of Elementary Colloid Chemistry," 

 London, 1925. 



Ostwald, Wo. : " Grundrissd. Kolloidchemie," 2nd ed., Dresden, 191 1. 



Ostwald, Wo. : " Theoretical and Applied Colloid Chemistry," Trans, 

 by Fischer, New York, 1917. 



Svedberg : " Herstellung KoUoidaler Losungen," Dresden, 1920. 



Taylor : " The Chemistry of Colloids," London, 1915- 



V. Bemmelen ; " Die Absorption," Dresden, 1910. 



Zsigmondy : " Colloids and the Ultramicroscope," Trans, by Alex- 

 ander, New York, 1909. 



Zsigmondy : " Kolloidchemie," Leipzig, 1925. 



