
The Famous Benjamin Franklin Letter On Lead Poisoning
Phila July 31, 1786 (To Benjamin Vaughan)
Dear Friend,
I recollect that when I had the great Pleasure of seeing you at Southampton, now a 12 month since, we
had some Conversation on the bad Effects of Lead taken inwardly; and that at your Request I promis'd to
send you in writing a particular Account of several Facts I then mention'd to you, of which you thought
some good Use might be made. I now sit down to fulfil that Promise.
The first Thing I remember of this kind, was a general discourse in Boston when I was a Boy, of a
Complaint from North Carolina against New England Rum, that it poison'd their People, giving them the
Dry Bellyach, with a Loss of the Use of their Limbs. The Distilleries being examin'd on the Occasion, it
was found that several of them used leaden Still-heads and Worms, and the Physicians were of the
Opinion that the Mischief was occasion'd by that Use of Lead. The Legislature of the Massachusetts
thereupon pass'd an Act prohibiting under severe Penalties the Use of such Still-heads & Worms
thereafter. Inclos'd I send you a Copy of the Act, taken from my printed Law book.
In 1724, being in London, I went to work in the Printing-House of Mr. Palmer, Bartholomew Close as a
Compositor. I there found a Practice I had never seen before, of drying a Case of Types, (which are wet
in Distribution) by placing it sloping before the Fire. I found this had the additional Advantage, when the
Types were not only dry'd but heated, of being comfortable to the Hands working over them in cold
weather. I therefore sometimes heated my Case when the Types did not want drying. But an old
Workman observing it, advis'd me not to do so, telling me I might lose the Use of my Hands by it, as two
of our Companions had nearly done, one of whom that us'd to earn his Guinea a Week could not then
make more than ten Shillings and the other, who had the Dangles, but Seven & sixpense. This, with a
kind of obscure Pain that I had sometimes felt as it were in the Bones of my Hand when working over the
Types made very hot, induc'd me to omit the Practice. But talking afterwards with Mr. James, a
Letter-founder in the same Close, and asking him if his People, who work'd over the little Furnaces of
melted Metal, were not subject to that Disorder; he made light of any Danger from the Effluvia, but
ascrib'd it to Particles of the Metal swallow'd with their Food by slovenly Workmen, who went to their
Meals after handling the Metal, without well-washing their Fingers, so that some of the metalline Particles
were taken off by their Bread and eaten with it. This appear'd to have some Reason in it. But the Pain I
had experienc'd made me still afraid of those Effluvia.
Being in Derbishire at some of the Furnaces for Smelting of Lead Ore, I was told that the Smoke of those
Furnaces was pernicious to the neighboring Grass and other Vegetables. But I do not recollect to have
heard any thing of the Effect of such Vegetables eaten by Animals. It may be well to make the Enquiry.
In America I have often observed that on the Roofs of our shingled Houses where Moss is apt to grow in
northern Exposures, if there be any thing on the Roof painted with white lead, such as Balusters, or
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