American Philosophical Society
| Type | Learned society, library, museum |
|---|---|
| Address | 104 South Fifth Street |
| Map | View on Google Maps |
| Neighborhood | Old City |
| Phone | (215) 440-3400 |
| Website | Official site |
| Established | 1743 |
| Founder | Benjamin Franklin |
| Hours | Thu-Sun 10 AM - 5 PM (museum) |
The American Philosophical Society (APS) is America's oldest learned society. Benjamin Franklin founded it in 1743 "for the promotion of useful knowledge." You'll find it on Independence Square in Old City. The Society's membership roll reads like a who's who of early American achievement: Washington, Jefferson, Adams, Darwin, Edison, Einstein, and plenty of others who shaped the nation's scientific and intellectual life. Today it runs the APS Museum and maintains extraordinary collections that document American science and history.[1]
Back in the 1700s, "philosophical" meant something different than it does now. Natural philosophy was the era's term for what we'd call science today. Franklin wanted to build something special: a place where educated men could swap discoveries and work toward improving human life. That original vision hasn't changed much. The Society carries on through its fellowship program, its publications, its library, and its museum, all housed in historic buildings that overlook Independence Square.[2]
History
Founding
Franklin started the American Philosophical Society in 1743 with an ambitious plan:
- A network of "ingenious men" spread across the colonies
- Regular exchange of scientific and practical knowledge
- An emphasis on "useful knowledge" that actually improved people's lives
- Philadelphia positioned as the nerve center
Things didn't go smoothly at first. But when it was reorganized in 1769, everything changed. The Society flourished from that point forward.
Early Members
The founding generation brought serious talent:
- Benjamin Franklin (the founder himself)
- Thomas Jefferson (served as the Society's third president)
- George Washington
- John Adams
- Benjamin Rush
- David Rittenhouse
- International figures: Lafayette, Volta, Humboldt
Achievements
The APS didn't just sit around talking. It got involved in major scientific work:
- Lewis and Clark Expedition: The Society gave advice and supplied equipment for this momentous exploration
- Transit of Venus (1769): The APS coordinated observations of this rare astronomical event
- Scientific publications: It publishes America's oldest continuously published learned journal
The Buildings
Three significant structures on Independence Square belong to the APS:
- Philosophical Hall (1789): The meeting place then and now
- Library Hall (reconstruction): Home to the APS Library
- Benjamin Franklin Hall: Where the museum exhibitions live
The APS Museum
Location
Drop by Benjamin Franklin Hall at 427 Chestnut Street to see the museum.
Exhibitions
What's on display? The museum explores:
- American science and discovery across centuries
- Life in the founding era
- Influential figures and their discoveries
- Materials from the Society's remarkable collections and archives
Notable Holdings
The collection includes items that'll make any history buff's heart skip a beat:
- Jefferson's handwritten draft of the Declaration of Independence
- Lewis and Clark journals
- Franklin's papers
- Darwin's first announcement of evolution to Americans
- Scientific instruments from the period
- Native American vocabularies that Jefferson compiled
The APS Library
Collections
This is one serious library. It contains:
- Over 350,000 books and bound periodicals
- More than 13 million manuscript pages
- Photographs and prints spanning centuries
- Materials focused on American science, medicine, and technology history
Access
Researchers can actually use it. The reading room sits in Library Hall and staff members are there to help. Some holdings have been digitized and put online so you don't have to travel to Philadelphia.
Research Programs
The Society supports scholarship in multiple ways:
- Fellowships for scholars doing serious research
- Digital projects that make materials more accessible
- Publications that share findings with the world
The Society Today
Membership
You can't just walk in and join. Membership works this way:
- Election only, based on accomplishment
- Restricted to scholars of genuine distinction
- Scientists, humanists, artists all represented
- Recent additions include notable figures from many fields
Programs
The APS stays active with:
- Public lectures that bring important topics to the wider community
- Symposia where scholars dive deep into issues
- Publications preserving and sharing research
- Prizes and awards recognizing outstanding work
Visiting the APS
Museum Hours
- Thursday through Sunday: 10:00 AM to 5:00 PM
- Closed: Monday, Tuesday, Wednesday
- Free admission - no charge at the door
Location
The three buildings sit on Independence Square, each with its own address:
- APS Museum: 427 Chestnut Street
- Philosophical Hall: 104 South Fifth Street
- Library Hall: 105 South Fifth Street
Tips
The museum is free, which means you're getting serious value. Check the website before you go because exhibitions rotate regularly. The buildings themselves are worth seeing even if you're not super interested in the collections. If you're visiting Independence Hall, the APS is right there.
Getting There
Multiple options work:
- SEPTA Market-Frankford Line: Get off at 5th Street Station
- SEPTA Bus: Try routes 17, 33, 44, or 48
- Walking: It's right on Independence Square
- Parking: Independence Mall garage is nearby
Nearby Attractions
You're in the right neighborhood for history:
- Independence Hall (it's right next door)
- Liberty Bell (one block away)
- Second Bank of the United States (across Chestnut Street)
- Carpenters' Hall (one block away)
See Also
- Benjamin Franklin
- Independence Square
- Old City, Philadelphia
- Science in Philadelphia
- Library Company of Philadelphia
References
- ↑ "About the APS". American Philosophical Society. Retrieved December 30, 2025
- ↑ "American Philosophical Society". Visit Philadelphia. Retrieved December 30, 2025