Emulsions of glycerin and olive oil were formed using anionic surface-active agents. The two surfactants used were condensation products of ammonia and of 2-amino-2-methyl-1,3-propanediol (AMP) with the fatty acids available in olive oil. The minimum concentration of ammonia needed for emulsification was found to be 0.6 mg./100 ml. and 0.84 mg./100 ml. at phase volumes of 0.40 and 0.58, respectively. The minimum concentration of AMP was 2 mg./100 ml. and 2.7 mg./100 ml. for phase volumes of 0.40 and 0.58, respectively. Total interfacial area was calculated from photomicrographs of the emulsions and correlated with interfacial tensions. The effective mean molecular areas of the surfactants, in the low concentrations employed, were sufficient to form 89 to 98 per cent interfacial coverage.