Mont. Code Ann. § 26-1-403
The jury is to be instructed by the court on all proper occasions:
History: En. Sec. 3390, C. Civ. Proc. 1895; re-en. Sec. 8028, Rev. C. 1907; re-en. Sec. 10672, R.C.M. 1921; Cal. C. Civ. Proc. Sec. 2061; re-en. Sec. 10672, R.C.M. 1935; R.C.M. 1947, 93-2001-1(part).