“By the law of England, marriage with a deceased wife's sister is, and has been since before the Reformation, within the prohibited degrees of affinity. In the year 1835 an act was passed, 5 & 6 Will. IV. c. 54, commonly called Lord Lyndhurst's Act, which effected certain changes. Prior to the act all marriages did not stand on the same footing. Some were good in all respects, and some were invalid on various grounds. Of these grounds of invalidity some were of temporal as well as of spiritual cognizance, and some of spiritual cognizance only; those of temporal cognizance were such as, where the provisions of the marriage acts had not been complied with, cases of bigamy, and cases of physical compulsion. In these the marriage was held ipso facto void by the temporal courts, on proof before them of the facts, without any previous ecclesiastical sentence.
“Those of spiritual cognizance were cases of incest, impotency, and the like, which having been originally derived into the law from the ecclesiastical laws, were held capable of being inquired into by the ecclesiastical courts only; and, in these cases, a marriage solemnized in facie ellesiæ in facie ellesiæ was presumed to be valid, by the temporal law, until the facts shewing its invalidity had been inquired into, and ascertained by a declaratory sentence of the Ecclesiastical Court, which could only be done during the lifetime of the parties; and after such sentence, such a marriage was held in all the courts to have been invalid ab initio to all intents and purposes. Such ecclesiastical sentence was necessary in all cases of incest. All marriages within the prohibited degrees were incestuous, and the law made no distinction between them. The offspring of a marriage with a man's own sister, without sentence of the Ecclesiastical Court during the lifetime of both parents, would have been legitimate. The law made no distinction between marriage with a deceased wife's sister, and with a brother's widow, a wife's mother or daughter, or a man's own sister. The necessity of a sentence of the Ecclesiastical Court was founded on the division of legal jurisdiction, according to which, just as the fact of murder could only be inquired into by a court of common law, so the fact of incest could only be inquired into by the Ecclesiastical Court. The effect of such sentence was retrospective, by the express terms of the 99th Canon of 1603, which only re-enacted the previous law. Every such marriage was to be adjudged to have been void from the beginning. In strict law, therefore, such marriages were void, the office of the Ecclesiastical Court being to pronounce a true sentence, and its sentence being declaratory that such marriage was, and had been void from the beginning; that sentence was