Monticello Dec. 20. 23.
Th: Jefferson returns his thanks to Doctor Van Rensslaer for the copy of instructive Essay on Salt, which he has been so kind as to send him. he has read it with satisfaction and much information beyond what he had before obtained, of the stores of that article existing so generally in the bowels of the earth. with his thanks, he prays him to recieve his respectful salutations.
NHi: Papers of Thomas Jefferson.