January 27th
1870 Louis A. Kahlenberg was born. He studied solutions, dialysis, gas electrodes, and the activation of gases by metals; investigated potentiometric titrations, boric acid in the treatment of blood poisoning, the use of colloidal gold in treatment of malignancies, and the use of dichloroaceticacid in medicine; his criticisms of Arrhenius' theory of ionization led to Debye's and Hückel's modifictions of the theory to account for the electrical interactions of the ions.
1865 F. August Kekulé presented his benzene structure to Société Chimique, Paris.