A pharmacological experiment was carried out on the fluid-extract of in vitro-culture of Claviceps parasited on “Tsuruyoshi, ” Phragmites prostratus Makino, grown wildly in the 'Kyoto district and gathered in December 1949, and it was proved that the fluid-extract exerted a strong contraction of the isolated uterus in rabbits and guinea-pigs, which may be attributed to ergotamine, probably being existed in this fluid-extract.
