Nevertheless, considerable opposition to this method of filling vacancies in the governorship had developed within the colony. This is shown in various protests which came from the Islands from time to time. These are set forth with great clarity in the correspondence of the governors. Corcuera, in a letter written to Philip IV on June 30, 1636, stated that these temporary governors had allowed persons in Mexico to make large fortunes out of the Philippine trade, and that the governors had devoted most of their time when in Manila to serving as agents of the residents of Mexico. Corcuera, however, seemed to regard the audiencia as incapable of government, for he claimed that in the brief term of a year in which the tribunal had ruled, three years prior to his accession, it had run the colony into debt from 80,000 to 100,000 pesos. He charged the oidores with the same dishonest practice as had been alleged against Governor Fajardo, namely, that they had issued due-bills in payment of debts and had bought them up later at less than their face value, realizing the full amount on them upon their presentation to the treasury later. He stated that these warrants were not only bought by the oidores, but by practically all the officials of the government. During Cerezo's term a sum in excess of 100,000 pesos was said to have been paid out to officials as usury. [631] Corcuera presented a scheme of reform designed to remedy the evils resulting from the succession either of the audiencia or of an irresponsible military commander to the ad interim governorship. He recommended that the regularly appointed governor should be assisted by five commissioners, who should be military men, holding the respective commands of Fort Santiago, Cavite, the Port of Manila, Formosa, and the Parián. These were to be eligible in the order named in case of a vacancy. This plan, like so many of the schemes of the soldier governors, only took cognizance of the military side of the governor's office. The marked tendency of these commanders was to continually underestimate the administrative and political phases of their positions. The plan of Corcuera was not adopted, however, and the viceroy continued to appoint temporary governors to succeed the audiencia when it assumed the government ad interim. Governor Diego Fajardo, on July 10, 1651, wrote a letter to the king protesting against the policy of appointment which was then in force. He said: I should be unfaithful to Your Majesty if I did not advise you of the inconveniences arising from the appointment of governors by the Viceroy of New Spain; the practice of sending money from Mexico for investment in this colony has continued and increased, to the exclusion and deprivation of the merchants of these Islands.... Investments have been made by the viceroys through the agency of others. [632]