The first question is whether the debenture charge has priority over the AIDC mortgages only for moneys owing on debenture stock issued strictly in compliance with the terms of the trust deed. The answer depends upon the true construction of the deed of postponement. It does not depend upon any notion of essential validity or invalidity of stock purported to be issued under or pursuant to the trust deed. Much argument was presented on the question whether certain requirements of the trust deed were conditions precedent to the validity of an issue of stock, and the argument proceeded on the premise that a failure to observe a condition precedent would make the issue of stock ultra vires and void. This premise is a mistaken one. The rule that the ultra vires act of a corporation is legally void has no operation because no question of legal capacity arises. The Society created a legal mortgage and vested it in the Trustee for those persons whom it should in terms of the trust nominate as beneficiaries. The interests of nominees were equitable interests created by the Society on exercise of the power reserved to it in the trust deed, and the principles applicable to the questions which arise are equitable principles, not the law of ultra vires. The effect of an irregularity or defect in the exercise of the power given to the Society under the trust deed would be to relieve an earlier appointee, i.e. stockholder, of his agreement, given by the acceptance of stock issued under the provisions of the trust deed, that his equitable interest though earlier in point of time should not have priority over but should rank pari passu with later equitable interests duly created by the Society. This effect of irregularity is in the present case subject to the power of the Trustee under cl. 35 (f) (i) to waive any breach by the Society of any of the covenants, obligations, conditions or provisions contained in the trust deed. Indeed the purpose of the waiver provision is that its exercise will give or preserve a pari passu ranking which would not otherwise exist. However, subject to these aspects of priority between the debenture holders, equity will have regard to the intention of the Society which is the beneficial owner of the Brooklyn property. Moreover, in favour of the appellant, a purchaser for value, equity would if necessary aid a defective execution of the power.