“…An inhibition of tumour growth brought about by colchicine is known both from animal material (e. g. AMOROSO, 1935; SEED, SLAUGHTER, and LIMARZI, 1940) and plant material (e. g. HAVAS, 1939 b;DERMEN and BROWN, 1940). Carcinogenic substances have also been found to inhibit the growth of animal tumours or of whole animals (e. g. HAVAS and GAL, 1938;WHITE and WHITE, 1939;HADDOW and ROBINSON, 1939;MORELLI, 1941), or growth within tissue cultures (EARLE and VOEGTLIN, 1938) and in plant tissue (PATTON and NEBEL, 1940).…”