* It has, however, been shown by Du Buy that the curvatures obtained are reduced when higher concentrations of agar are employed. Our value of K/v applies to 1.5% agar. Boner, J. F., Biol. Zentr., 52, 565 (1932). Boysen-Jensen, P., Biochem. Zeit., 236, 205 (1931). Boysen-Jensen, P., Biochem. Zeit., 250, 270 (1932). Du Buy, H., Proc. Kon. Akad. Wetensch. Amsterdam, 34, 1 (1931). Dolk, H. E., Dis...