(1) Contracts on behalf of a company may be made as follows (that is to say):
(i) Any contract which if made between private persons would be by law required to be in writing, and if made according to English, law to he under seal, may be made on behalf of the company in writing under the common seal of the company, and may in the same manner be varied or discharged:
(ii) Any contract which if made between private persons would be by law required to be in writing, signed by the parties to be charged therewith, may be made on behalf of the company in writing signed by any person acting under its authority, express or implied, and may in the same manner be varied or discharged:
(iii) Any contract which if made between private persons would by law be valid although made by parol only, and not reduced into writing, may be made by parol on behalf of the company by any person acting under its authority, express or implied, and may in the same manner be varied or discharged.
(2) All cont