it has been observed: "It may be that it can be inferred from the terms of the contract that the power to order extras, although apparently unlimited, is in fact limited to ordering extras up to a certain value and, in such a case, extras ordered in excess of that amount, although work of a kind contemplated by the contract, may yet be quite outside the terms of the con tract." (p. 294) "If the extra work ordered is outside the contract the terms of the contract have no application." (p. 296) In this context it would be relevant to take note of the decision of the Court of Appeal in England in Parkinson (Sir Lindsay) & Co. Ltd. vs Commissioners of His Majesty 's Works and Public Buildings, In that case the contractors had agreed with His Majesty 's Commissioners of Works and Public Buildings to erect an ordnance factory according to the general conditions and specifications and bills of quantities and drawings annexed for the contract sum of Pound 3,500,000 and under the general conditions of contract the Commissioners had power, at their absolute discretion, to modify the extent and character of the work or to order alterations of or additions to the works and it was the duty of the contractor to comply with the archi tect 's instructions in this respect.