The post office was subordinate to the treasury, a relationship it never permitted itself to disregard. The deputy postmaster general was under strict injunctions not to enter upon any scheme for the extension or improvement of the postal service, unless he was fully satisfied that the resulting expense would be covered by the augmented revenue. Each application for improvement in the service was dealt with from this standpoint. The fact that the service in any part of the country was very profitable to the post office was held to be no justification for applying any portion of the profits to make up the deficiencies of revenue in districts less favourably situated. On one occasion, where the needs in some new districts in course of settlement appeared to Heriot to demand special consideration, he directed that for a time the whole of the surplus revenue from Upper Canada should be applied to extensions and improvements. When his action was reported to the postmaster general, it was promptly disavowed, and he was compelled to cancel the arrangements he had made.[155] A policy of this kind was ill-adapted to colonies, which were steadily expanding by the implanting of small, widely-separated communities, and the man on whom devolved the duty of carrying on a postal service under these conditions had no easy task. Finlay had certain advantages as a member of the legislative council which Heriot did not enjoy, and moreover his difficulties were not so great. It was only after Finlay had ceased to be deputy postmaster general that the settlements in Upper Canada began to insist on a regular postal service; and in cases where demands were made upon him which his instructions forbade him to grant, he could always depend on the good will of his associates in the council to relieve him from unreasonable pressure. As superintendent of post houses, his influence with the _maitres de poste_ enabled him to keep the cost of their services on the main routes at a low figure. Although Finlay's connection with the post office was terminated under disagreeable circumstances, no attempt was made to deprive him of his provincial appointments, which he held until his death at the end of 1801. Heriot then lost no time in applying to be appointed to the vacancy in the legislative council, and to the superintendency of post houses. He was successful in neither case. Heriot was uniformly unfortunate in his relations with the governors of the colony. His self-assertiveness irritated those who were accustomed to look for nothing but deference from the persons about them. Heriot seems to have accepted the decision as respects the council as final. But he made a strong effort to force the hand of lieutenant governor Milnes with regard to the post houses. He appealed to the postmaster general in England, who made representations to the colonial office in the matter.