PHASE REVERSAL IX EMULSIONS AND IN PROTOPLASM 139 



the hydroxide of sodium will reverse, and since the hydroxide of both 

 sodium and barium will (partially) reverse one particular emulsion, one 

 is forced to conclude that valency of the cation is not alone the deter- 

 mining factor in phase reversal. Nor does it seem possible to formulate 

 any general rule regarding the relative potency of cations and anions in 

 causing reversal. 



9. The behavior of emulsions varies with and is dependent upon the 

 type of emulsifier. 



BIBLIOGRAPHY 



(1) Bachmann: Zeitschr. f. anorg. Chem., 1912, lxxiii, 125. 



(2) Bhatnagar: Journ. Chem. Soc, 1920, cxvii, 542. 



(3) Bhatnagar: The phys. and chem of colloids, Rep. Faraday Soc— Phys. 



Soc. London, 1921, 27. 



(4) Briggs: Journ. Phys. Chem., 1920, xxiv, 120. 



(5) Clayton: Second report of the B. A. A. S. on colloid chemistry, 2nd ed 



1921, 98. 



(6) Clowes: Journ. Phys. Chem., 1916, xx, 407. 



(7) Fitting: Jahr. f. wiss. Bot., 1917, lviii, 553. 



(8) Hatschek: Second report of the B. A. A. S. on colloid chemistry, 2nd ed 



1921, 16. 



(9) Herlant: Arch. d. Biol., 1920, xxx, 517. 



(10) Laing and McBain: Trans. Chem. Soc, 1920, cxvii, 1503. 



(11) Osborne and Campbell: Journ. Amer. Chem. Soc, 1900, xxii, 413. 



(12) Osterhout: Bot. Gaz., 1915, lix, 317. 



(13) Seifriz: Bot. Gaz., 1923, Ixxvi. 



(14) Zsigmondy: Kolloidchemie, Leipzig, 1920. 



