Rules of interpretation or construction depend chiefly on decisions of the courts, to a smaller extent on statutory enactment. The law was gradually brought into its present condition through precedents extending back for centuries, especially decisions of the court of chancery, the court par excellence of construction, as distinguished from the court of probate. The court of probate did not deal unless incidentally with the meaning of the will; its jurisdiction was confined to seeing that it was duly executed. The present state of the law of interpretation is highly technical. Some phrases have obtained a conventional meaning which the testators who used them probably did not dream of. Many of the judicial doctrines which had gradually become established were altered by the Wills Act 1837.