Monticello Mar. 26. 20.
Th: Jefferson returns his thanks to mr Porter for the copy of the constn of the Amer. geolog. soc. which he has had the kindness to send him. the names of it’s officers subjoined are a sufficient pledge to the world of it’s future usefulness & celebrity. he salutes the Society & mr Porter with the most respectful considn
DLC: Papers of Thomas Jefferson.