"This is an appeal by the Commissioner of Taxation from the decision of a Board of Review constituted under the Income Tax Assessment Act 1922‑1925. Under sec 51(6) of that Act the appeal may be brought from any decision of the Board which, in the opinion of this Court, involves a question of law. The Board, in its proceedings, did not exercise the judicial power of the Commonwealth, but an administrative function, namely, that of reviewing the Commissioner's assessments for the purpose of ascertaining the taxable income upon which tax should be levied. The appeal to this Court submits the ascertainment of the taxpayer's liability to judicial review and ascertainment, but the so-called appeal is a proceeding in the original, and not within the appellate, jurisdiction of the Court. It follows, I think, that the parties on this appeal are not limited to the material that was before the Board of Review, but are entitled to adduce before this Court such evidence in support of, or in answer to, the appeal as is relevant to the matter. The material before the Board and its decision and reasons should be brought before this Court, and the parties may use this material if they so desire, but further or additional evidence may be adduced, or the appeal may be conducted as an original cause brought in this Court. A taxpayer, however, is limited by the Act, sec 51(2), in such proceedings, to the grounds stated in his objection to the assessment, and an appellant should be limited to the grounds of appeal stated in his initiating process in this Court, that is, his notice of appeal, unless he obtain leave to amend it."