No doubt can be entertained, that Mr. Rittenhouse derived the great and extraordinary faculties of his mind from nature; and it is equally evident, that for some years after he arrived to manhood, he possessed very slender means of improving his natural talents: Nay further, it is well known to those who were long personally acquainted with him, that after his removal to Philadelphia, when he was eight-and-thirty years of age, a period of life at which the place of his residence, and the condition of his pecuniary affairs, united in placing within his reach much that is dear to science,—even then, his long continued professional employment and the various public stations he filled, in addition to frequent ill health, deprived him of a large share of those advantages. The vast stock of knowledge which, under such untoward circumstances, he actually acquired, is therefore an additional proof of his native strength of intellect. But, wonderful as a kind of intuitive knowledge he possessed really was, his mental powers would probably have remained hidden from the world, they would have been very imperfectly cultivated, at best, had not an incident apparently trivial, and which occurred when our Astronomer was a young boy, furnished what was, in all probability, the very first incitement to an active employment of his philosophical as well as mechanical genius. Mr. Rittenhouse’s mother having been already noticed somewhat particularly, the reason for this being done shall be here stated: it is connected with the incident just now referred to. This valuable woman had two brothers, David and Lewis Williams (or William), both of whom died in their minority. David, the elder of these, pursued the trade of a carpenter, or joiner. Though, like his nephew and namesake, he was almost wholly an uneducated youth, he also, like him, early discovered an unusual genius and strength of mind. After the death of this young man, on opening a chest containing the implements of his trade which was deposited at Mr. M. Rittenhouse’s, (in whose family it is presumed he dwelt,) a few elementary books, treating of arithmetic and geometry, were found in it: With these, there were also various calculations and other papers, in manuscript; all, the productions of David Williams himself, and such as indicated not only an uncommon genius, but an active spirit of philosophical research. To this humble yet valuable coffer of his deceased uncle, Mr. Rittenhouse had free access, while yet a very young boy. He often spoke of this acquisition as a treasure; inasmuch as the instruments of his uncle’s calling afforded him some means of exercising the bent of his genius towards mechanism, while the books and manuscripts early led his mind to those congenial pursuits in mathematical and astronomical science, which Were ever after the favourite objects of his studies.[75] ----- Footnote 75: