When a convention was called to meet in Philadelphia, in 1787, for the purpose of giving more energy to the government of the union, by revising and amending the articles of confederation, Dr. Franklin was appointed a delegate from the State of Pennsylvania. He signed the constitution which they proposed for the union, and gave it the most unequivocal marks of his approbation.
A society for political inquiries, of which Dr. Franklin was president, was established about this period. The meetings were held at his house. Two or three essays read in this society were published. It did not long continue.
In the year 1787, two societies were established in Philadelphia, founded on the principles of the most liberal and refined humanity: The Philadelphia Society for alleviating the miseries of public prisons: and the Pennsylvania Society for promoting the abolition of slavery, the relief of free negroes unlawfully held in bondage, and the improvement of the condition of the African race. Of each of these Dr. Franklin was president. The labours of these bodies have been crowned with great success; and they continue to prosecute, with unwearied diligence, the laudable designs for which they were established.
Dr. Franklin's increasing infirmities prevented his regular attendance at the council chamber, and in 1788 he retired wholly from public life.
His constitution had been a remarkably good one. He had been little subject to disease, except an attack of the gout occasionally, until about the year 1781, when he was first attacked with symptoms of the calculous complaint, which continued during his life. During the intervals of pain from this grievous disease, he spent many cheerful hours, conversing in the most agreeable and instructive manner. His faculties were entirely unimpaired, even to the hour of his death.
His name, as president of the abolition society, was signed to the memorial presented to the House of Representatives of the United States, on the 12th of February, 1789, praying them to exert the full extent of power vested in them by the constitution in discouraging the traffic in the human species. This was his last public act. In the debates to which this memorial gave rise, several attempts were made to justify the trade. In the Federal Gazette of March 25, there appeared an essay, signed Historicus, written by Dr. Franklin, in which he communicated a speech, said to have been delivered in the Divan of Algiers, in 1687, in opposition to the prayer of the petition of a sect called Erika, or purists, for the abolition of piracy and slavery. This pretended African speech was an excellent parody of one delivered by Mr. Jackson, of Georgia. All the arguments urged in favour of negro slavery are applied with equal force to justify the plundering and enslaving of Europeans. It affords, at the same time, a demonstration of the futility of the arguments in defence of the slave-trade, and of the strength of mind and ingenuity of the author, at his advanced period of life. It furnished, too, a no less convincing proof of his power of imitating the style of other times and nations than his celebrated parable against persecution. And as the latter led many persons to search the scriptures with a view to find it, so the former caused many persons to search the bookstores and libraries for the work from which it was said to be extracted.
During the greatest part of his life Dr. Franklin had enjoyed an almost uninterrupted state of good health, and this he entirely attributed to his exemplary temperance.
In the year 1735, indeed, he had been seized with a pleurisy, which ended in a suppuration of the left lobe of the lungs, so that he was almost suffocated by the quantity of matter thrown up. But from this, as well as from another attack of the same kind, he recovered so completely, that his breathing was not in the least affected.
As he advanced in years, however, he became subject to fits of the gout, to which, in 1782, a nephritic cholic was superadded. From this time he was also affected with the stone as well as the gout; and for the last twelve months of his life these complaints almost entirely confined him to his bed.
Notwithstanding his distressed situation, neither his mental faculties nor his natural cheerfulness ever forsook him. His memory was tenacious to the very last; and he seemed to be an exception to the general rule, that, at a certain period of life, the organs which are subservient to this faculty become callous; a remarkable instance of which is, that he learned to speak French after he had attained the age of seventy!