1From Thomas Jefferson to Charles Thomson, 20 April 1791 (Jefferson Papers)
Mr. Madison and myself have been in the constant purpose, as soon as the roads should get a little smooth, to ride out some morning and pay our respects to you: the late rains have disappointed us in that respect. The Philosophical society have appointed a committee, of which you are named, to collect materials for forming the natural history of the Hessian fly, the best means of preventing or...