Monto July 22.
Your favor of the 14th was recd yesterday
Your son in law, the son of Dr Patterson the elder and Dr Patterson the son himself have a right to every service I can render them. I have not hesitated then to write to the President on the subject and to add my testimony to your’s in favor of your friend and connection. there was one point unknown to myself and on which your lre was silent. that office was given to mr Rittenhouse for the eminence of his mathematical science; to Dr Patterson the elder on the same ground, requiring a good degree of mathemat. & mechanl science. in writing to the Pres. therefore I was obliged to substitute presumption on that point that the father having been a great mathemetician, and having himself educated his son, he could not fail to have given him a sfft proficiency in that science. wishing success to Dr Patterson’s views I always remain your constant and affecte friend
DLC: Papers of Thomas Jefferson.