Jacques Loeb. Amphoteric colloids. IV. The influence of the valency of cations upon the physical properties of gelatin
Reprinted from J. Gen. Physiol., 1919, 1(4):483-504
Jacques Loeb. Amphoteric colloids. III. Chemical basis of the influence of acid upon the physical properties of gelatin
Reprinted from J. Gen. Physiol., 1919, 1(3): 363-385