Divorces may be granted for any of the following causes:
5. Habitual intemperance.
7. When either the husband or wife has become permanently insane, as provided in sections
32-801 to
32-805, inclusive.
8. Irreconcilable differences.
[(32-603) 1863, p. 616, sec. 22; R.S., sec. 2457; am. 1899, p. 232, sec. 1; 1903, p. 332, sec. 1; compiled and reen. R.C. & C.L., sec. 2647; C.S., sec. 4627; I.C.A., sec. 31-603; am. 1971, ch. 20, sec. 1, p. 33.]