Section 21. Agent of person under disability

21. Agent of person under disability. Acknowledgment or payment by one of several joint contractors, etc. 22. Effect of substituting or adding new plaintiff or defendant. 23. Continuing breaches and wrongs. 24. Suit for compensation for act not actionable without special damage. 25. Computation of time mentioned in instruments. PART IV. ACQUISITION OF OWNERSHIP BY POSSESSION. 26. Acquisition of right to easements. 27. Exclusion in favour of reversioner of servient tenement. 28. Extinguishment of right to property. PART V. SAVINGS AND REPEALS. 29. Savings. 21. (1) The expression "agent duly authorized in this behalf," in sections 19 and 20, shall, in the case of a person under disability, include his lawful guardian, committee or manager, or an agent duly authorized by such guardian, committee or manager to sign the acknowledgment or make the payment. (2) Nothing in the said sections renders one of several joint contractors, partners, executors or mortgagees chargeable by reason only of a written acknowledgment signed or of a payment made by, or by the agent of, any other or others of them.