1. Dhéré and Gorgolewski,Jour. Physiol. path. gen., 1910,12, 645; 1911, 13, 157 and 167.
2. Arisz,Kolloidchen Beihefte, 1915,7, 22.
3. Kræmer and Fanselow,Jour. Phys. Chem., 1925,29, 1169.
4. Kræmer and Dexter,Ibid.,, 1927,31, 764.
5. Holwerda,Rec. Tran. Chim., 1931,50, 601.