A renowned Lewis and Clark scholar will shed light Friday night on medicines used during the expedition of 1804-1806 as the Corps of Discovery made its way across the continent.

The public is invited to a free educational presentation at 7 p.m. in the Tualatin Heritage Center, 8700 S.W. Sweek Drive.

John Fisher of Lewiston, Idaho, will answer questions about medicines Sacagawea and her baby received on the journey as well as native remedies she introduced to Lewis and Clark as he shares his new presentation, "Medicine, Madame Charbonneau and Pomp." Fisher will also show examples of these medicines and other items from his collection of Lewis and Clark medical supplies and books.

A retired high school teacher, Fisher has spent many years studying and teaching about Lewis and Clark, earning several teaching awards and a reputation as one of the most knowledgeable people about the expedition. He currently serves as an interpretive consultant to the Fort Mandan Foundation for the Lewis and Clark Interpretive Center in Washburn, N.D.

The presentation is sponsored jointly with the Oregon Chapter of the Lewis and Clark Trail Heritage Foundation. For more information, contact Mark Johnson at 503-805-6691.