- 11 -

234337

the ductless portion of pancreatic or related glands in concentrated form and sufficiently free from impurities for repeated administration to patients having hereindescribed physiological characteristics which consists of extracting said substance from the gland with a solvent, separating the substance from the solution with ammonium sulphate, dissolving the ammonium sulphate from said substance, concentrating said substance with benzoic acid, separating said substance from the benzoic acid, and making an aqueous sterile solution of said substance.