His studious habits, and zealous investigation of the works of nature, led Mr. Rittenhouse to devote as much of his time, as the delicate state of his health permitted him to retrench from occasional public employments and his private occupations, to those objects for the promotion of which the American Philosophical Society was instituted. After he fixed his residence in Philadelphia, the established seat of that Society, he attended their Meetings pretty regularly; and by that means had an opportunity of forming a more intimate acquaintance with many persons, most conspicuous, at that time, for talents, knowledge, and learning. His great abilities had then become almost universally known; and these, in connexion with the suavity of his deportment, his great modesty, and exemplary moral character, had not only procured him the esteem and respect of all good men; but confirmed the friendship of his old acquaintances, and attached to him the high and sincere regard of many new ones. As one instance, among many, of the distinguished estimation in which Mr. Rittenhouse was held by his fellow-citizens, after a residence of between four and five years in Philadelphia; the American Philosophical Society petitioned the legislature, on the 6th of March, 1775, fer pecuniary aid, to enable them to erect an Observatory; and to allow Mr. Rittenhouse an annual salary, as the “Public Astronomical Observer.” The objects of this application were important, in a public view; and its whole tenor was alike honourable to the enlightened patriotism of the Philosophical Society, and the merit of the person to whom, more particularly, it had reference.[178] Indeed, such a public act of so respectable a body as that society, is a testimonial reflecting great honour on the character of Mr. Rittenhouse; insomuch, that it would be doing injustice to his memory, not to insert it in these Memoirs of of his Life. It is as follows: ----- Footnote 178: Mr. Rittenhouse is not mentioned in the petition, by name. This was unnecessary: for it was universally known, that it could apply to no other person in America, so unquestionable and pointed are its allusions to him; and that, perhaps, no other Astronomer then living, so well merited the high encomiums on his philosophical abilities, which it contains. ----- “To the honourable the Representatives of the Freemen of the province of Pennsylvania, in General Assembly met: “The Representation and Petition of the American Philosophical Society, held at Philadelphia, for promoting useful knowledge. “Gentlemen,