In Philadelphia, Mr. Rittenhouse resumed the discharge of his official functions, as treasurer of the state; an office, in the execution of which there were very numerous and complicated duties, arising out of the novel system of finance and paper-credit, pursued by both the general and state governments during the war: consequently, his attention to this business engrossed so much of his time, as to leave him little leisure for pursuits more congenial to his mind.

In a very short time after Mr. Rittenhouse’s return to Philadelphia he received a letter from Mr. Jefferson, congratulating him on that happy event: and expressing, in very forcible terms, the exalted sense that gentleman entertained of our Philosopher’s genius, talents, and usefulness. It indicates, also, the solicitude felt by its writer, lest the Orrery of Mr. Rittenhouse’s invention and construction, belonging to the College of Philadelphia, had been either removed or injured by the British forces, while they occupied that city. On this head, however, the apprehensions conceived by Mr. Jefferson proved to be groundless: for, not only was the Orrery not removed from its proper station; but, at the instance of the Rev. Dr. Smith, the provost of the College, the apartment in the College edifice which contained the invaluable machine, was closed up by order of Sir William Howe, to prevent its being injured; and no person was permitted to enter that apartment to view the Orrery, without the Provost’s consent; on which occasions he uniformly attended in person, with the keys kept in his possession. The means thus used, to secure from any injury property so inestimable to the friends of science, is a circumstance that certainly reflects much honour upon the parties by whom they were effected,—even though one of them was, at that time, necessarily viewed in the character of an “enemy.”

But, in order that the reader may be enabled to form his own judgment, on Mr. Jefferson’s estimate of genius, and concerning the rank and privileges to which the distinguished writer conceives men of great philosophical talents are entitled, the letter, just referred to, is now presented to him: it is as follows.

Monticello in Albemarle, Virginia, July 19, 1778.

“Dear sir,

“I sincerely congratulate you on the recovery of Philadelphia, and wish it may be found uninjured by the enemy. How far the interests of literature may have suffered by the injury or removal of the Orrery (as it is miscalled), the public libraries, and your papers and implements, are doubts which still excite anxiety. We were much disappointed in Virginia generally, on the day of the great eclipse,[[194]] which proved to be cloudy in Williamsburg, where it was total. I understand, only the beginning was seen at this place, which is in Latitude 38° 8′ and Longitude West from Williamsburg, about 1° 45′ as is conjectured; eleven digits only were supposed to be covered. It was not seen at all till the moon had advanced nearly one-third over the sun’s disc. Afterwards, it was seen at intervals through the whole. The egress particularly was visible. It proved, however, of little use to me, for want of a time-piece that could be depended on; which circumstance together with the subsequent restoration of Philadelphia to you, has induced me to trouble you with this letter, to remind you of your kind promise of making me an accurate clock, which being intended for astronomical purposes only, I would have divested of all apparatus for striking, or for any other purpose, which by increasing its complication might disturb its accuracy. A companion to it, for keeping seconds, and which might be moved easily, would greatly add to its value. The theodolite, for which I spoke to you also, I can now dispense with, having since purchased a most excellent one.

“Writing to a Philosopher, I may hope to be pardoned for intruding some thoughts of my own, though they relate to him personally. Your time for two years past has, I believe, been principally employed in the civil government of your country. Though I have been aware of the authority our cause would acquire with the world from its being known that Yourself and Doctor Franklin were zealous friends to it, and am myself duly impressed with a sense of the arduousness of government, and the obligation those are under who are able to conduct it; yet I am also satisfied there is an order of geniuses above that obligation, and therefore exempted from it. Nobody can conceive that nature ever intended to throw away a Newton upon the occupations of a crown. It would have been a prodigality for which even the conduct of Providence might have been arraigned, had he been by birth annexed to what was so far below him. Co-operating with nature in her ordinary economy, we should dispose of and employ the geniuses of men according to their several orders and degrees. I doubt not there are in your country many persons equal to the task of conducting government: but you should consider that the world has but one Rittenhouse, and that it never had one before. The amazing mechanical representation of the solar system which you conceived and executed, has never been surpassed by any but the work of which it is a copy. Are those powers then, which, being intended for the erudition of the world, are, like air and light, the world’s common property, to be taken from their proper pursuit to do the common-place drudgery of governing a single state, a work which may be executed by men of an ordinary stature, such as are always and every where to be found? Without having ascended Mount Sinai for inspiration, I can pronounce that the precept, in the decalogue of the vulgar, that they shall not make to themselves the ‘likeness of any thing that is in the heavens above,’ is reversed for you, and that you will fulfil the highest purposes of your creation by employing yourself in the perpetual breach of that inhibition. For my own country in particular, you must remember something like a promise that it should be adorned with one of them. The taking of your city by the enemy has hitherto prevented the proposition from being made and approved by our legislature. The zeal of a true whig in science must excuse the hazarding these free thoughts, which flow from a desire of promoting the diffusion of knowledge and of your fame, and of one who can assure you truly that he is with much sincerity and esteem your most obedient and most humble servant.

Th. Jefferson.

“P. S. If you can spare as much time as to give me notice of the receipt of this, and what hope I may form of my Clock, it will oblige me. If sent to Fredericksburg, it will come safe to hand.”

In the commencement of the year 1779, our benevolent Philosopher had an opportunity of testifying the friendly interest he took in the prosperity of his brother-in-law the Rev. Mr. Barton, and his family. This gentleman was then, with Mrs. Barton,[[195]] in the city of New-York; to which they went towards the close of the year 1778, in pursuance of a permission granted for that purpose by the government of Pennsylvania, under certain conditions. All Mr. Barton’s children excepting the eldest, (the writer of these Memoirs), who was then abroad, remained in Pennsylvania; those in their minority, being six of the seven so remaining, having been previously placed under the charge of suitable persons. After a long absence of the eldest son from his native country, he returned to Pennsylvania the beginning of the year 1779. Immediately after his arrival at Lancaster, he received a letter from Mr. Rittenhouse, dated in Philadelphia, January 24th 1779, in which he says—“I most sincerely congratulate you on your safe arrival, and impatiently expect the pleasure of seeing you here. I received yours from Baltimore, ten days after the date, and immediately wrote to your father,[[196]] supposing him to be still at New-York;[[197]] though we cannot be certain as to that matter.” The Rev. Mr. Barton, on the 15th of February, acknowledged the receipt of his brother-in-law’s letter to him, which, although dated the 16th of January, did not reach him until the 13th of the succeeding month. In this answer, Mr. Barton says;—“To see, and to be united with my children, is my most earnest wish; but how that happy event is to be obtained, I know not: If my son should choose to come to Elizabeth-Town, perhaps I might be indulged with a flag, to have an interview with him there.”[[198]]