[505] Since 1861 these marriages have thus been void without judicial proceedings; while those below the age of consent, or when there was want of understanding, or when obtained by fraud with no subsequent voluntary cohabitation, are void from the time a decree of nullity is pronounced. But a marriage shall in no case be adjudged a nullity, on the ground of being under age of consent, if the parties cohabited freely after reaching that age; nor the marriage of an insane person, if there be similar cohabitation after restoration to reason: act of March 28: _Laws_ (1861), 96, 97; same in _Comp. Laws_ (1900), 115. [506] _Cf._ the act of Nov. 28: _Laws_ (1861), 96-99; that of Feb. 15: _Laws_ (1875), 63; and _Comp. Laws_ (1900), 115-18. Partial divorce is not recognized; but the common law, as administered by the ecclesiastical courts, is a part of the law of Nevada, so far as not superseded by statute: Wuest _v._ Wuest, 17 _Nev._, 216. For the interpretation of extreme cruelty see Reed _v._ Reed, 4 _Nev._, 395; Gardner _v._ Gardner, 23 _Nev._, 207; Kelley _v._ Kelley, 18 _Nev._, 48. For Alaska the act of Congress does not authorize partial divorce; but marriage may be dissolved for (1) impotency; (2) adultery; (3) conviction of felony; (4) two years' wilful desertion; (5) "cruel and inhuman treatment, calculated to impair health or endanger life;" or (6) habitual gross drunkenness contracted since marriage and continuing one year before the suit.[507] [507] _U. S. Stat. at Large_, XXXI, 408-10; _Laws of Alaska_ (1900), 243-46.