Surry, Blue Hill, 27 Augt. 1808
From the conviction that nothing conducive in any way to the prosperity of our country can be uninteresting to you, I take the liberty to send you enclosed a transcript of a supplement to the Gazette of Madrid containg some important observations & facts respecting the yellow fever. This tract is not only valuable by indicating a preventive, as well as a specific remedy, (if the author may be credited) for this hitherto fatal disorder; but also by the tendency of some of the facts to favor the opinion of its not being contagious: for should this opinion become universal our vessels would probably be releived from the protracted & ruinous quarantine they now have to suffer throughout Spain & on the shores of the Mediterranean.
I am, very respectfully, Sir! Yr mo Obdt Servt.
Leod. Jarvis 3d
DLC: Papers of Thomas Jefferson.