Mo. Rev. Stat. § 272.150
The owners and occupiers of saltpeter works within this state shall keep the same enclosed with a good and lawful fence, so as to prevent horses, cattle and other stock that may receive injury thereby from having access thereto.
(RSMo 1939 § 14583)
Prior revisions: 1929 § 12922; 1919 § 5527; 1909 § 6470