There is a further reason why the provisions of s. 5 of the Act do not, in the circumstances, have the effect that Hexyl is liable to Construction as an undisclosed principal under the building contract. The provisions of that section are, as has been seen, concerned with the actual or ostensible authority of a partner to bind his firm. They do not produce the consequence that a partner who has authority to enter into a contract as agent for his firm cannot enter into a contract as trustee for himself and his partners. Even if the effect of s. 5 had been that Tambel had actual or ostensible authority to enter into the building contract on behalf of Hexyl as an undisclosed principal and itself, the fact would remain that it did not, on the material before the Court, contract in that capacity. As between Tambel and Hexyl, the material before the Court indicates that the building contract was entered into by Tambel in pursuance of the partnership deed, that is to say, as principal acting, at most, as trustee for the partnership. In so far as Construction was concerned, the building contract was made between Tambel and itself as the only principals. That being so, it would not be to the point to establish that Tambel had had actual or ostensible authority to contract for Hexyl and itself as principals. The fact would remain that it had not purported to exercise that authority and that it had not been understood by the other party to the contract as exercising any such authority.