About 80,000 people visit the House of Happy Walls at Jack London State Park every year, taking the time to view the displays of the author’s life and that of his wife Charmian London, and their journey together on the Snark to the South Seas in the early years of the 20th century.

But few of them pay as much attention to the 10-inch long black leather case packed with narrow vials as did Richard Rocco on his visit last year. An associate professor of pharmacology at Samuel Merritt University in Oakland, he wondered what those vials contained, thinking they might provide a “historical snapshot” of medicine used 100 years ago.

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