Notes and Reflections on Books and Media
by Hannah Leitheiser
The Character of Merriweather Lewis
When Lewis and Clark went on their expedition, they received advice from the best doctor of the time, Dr. Rush. They brought along many of his famous Thunderbolt pills which were powerful laxities given if someone showed signs of getting sick. I didn't before realize that they contained mercury sufficient that Lewis and Clark camps could be discovered by looking at mercury concentrations in the soil.