83. Where a trust is incapable of being executed, or where the trust is completely executed without exhausting the trust-property, the trustee, in the absence of a direction to the contrary, must hold the trust-property, or so much thereof as is unexhausted, for the benefit of the author of the trust or his legal representative.Illustrations (a) A conveys certain land to B-“upon trust”, and no trust is declared; or“upon trust to be thereafter declared,” and no such declaration is ever made; orupon trusts that are too vague to be executed; orupon trusts that become incapable of taking effect; or“in trusts for C,” and C renounces his interest under the trust. In each of these cases B holds the land for the benefit of A. (b) A transfers Tk. 10,000 in the four per cents. to B, in trust to pay the interest annually accruing due to C for her life. A dies. Then C dies, B holds the fund for the benefit of A's legal representative. (c) A conveys land to B upon trust to sell it and apply one moiety of the proceeds for certain charitable purposes, and the other for the maintenance of the worship of an idol. B sells the land, but the charitable purposes wholly fail, and the maintenance of the worship does not exhaust the second moiety of the proceeds. B holds the first moiety and the part unapplied of the second moiety for the benefit of A or his legal representative. (d) A bequeaths Tk. 10,000 to B, to be laid out in buying land to be conveyed for purposes which either wholly or partially fail to take effect. B holds for the benefit of A's legal representative the undisposed of interest in the money or land if purchased.