There is one matter on which, though it has only a very indirect bearing on the question now in hand, I think I should express an opinion at the outset. Although s. 52 (3) gives a right of appeal to this Court from a refusal by the Commissioner to accept an application, and although s. 53 (3) speaks of "the time within which an appeal may be instituted", the fact is, I am told, that neither the Act nor the Regulations made under it prescribe any time within which a notice of motion instituting an appeal may be given. In these circumstances there seem to be three possible views. The first is that there is no time limit. The second (which was advanced by Mr. King, who appears for the appellant) is that notice of appeal must be given within a reasonable time. The first view could lead to grave inconvenience. The second also is an inconvenient view, and I can, in any case, see no real reason for saying that the right given is subject to an implied condition that it shall be exercised within a reasonable time. The third view, which is, in my opinion, the correct view, is that, until special provision is made by or under the Patents Act, or by or under the High Court Procedure Act 1903-1950, the position is governed by O. 70 r. 6 of the Rules of the High Court, and the notice must be filed and served within twenty-one days. Rule 2 of O. 66A, which deals with proceedings under the Patents Act, provides: - "This Order applies to all proceedings in the Court under the Act". Rule 3 provides: - "Subject to this Order, the provisions of the other Orders of these Rules, other than Order 66, apply, so far as is practicable, to proceedings to which this Order applies". The words "so far as is practicable" are, I think, intended to give the rule a wide application, and I think the meaning of the rule is that, if a question of procedure arises for which no special provision is made in O. 66A, and if there is some rule outside O. 66A which deals generally with the relevant subject and is capable of being applied mutatis mutandis, then that rule is to be regarded as applicable to the case. On this view of O. 66A r. 3 we are justified, in the absence of any specific provision, in regarding O. 70 r. 6 as applicable to appeals under s. 52 (3) of the Patents Act. A somewhat similar solution of a similar problem was found by Hood J. in In re Sulman and Teed [1] , but I am inclined to think that O. 66A r. 3 provides firmer ground for the conclusion than seems to have existed in that case.