Pasteur Institute
Jun 4 Pasteur Institute founded by French biologist Louis Pasteur and Émile Roux in Paris
- Jun 7 Monotype type-casting machine patented by Tolbert Lanston, Washington, D.C.
- Jun 8 Herman Hollerith receives a patent for his punch card calculator
- Jun 9 21st Belmont: Jim McLaughlin aboard Hanover wins in 2:43.5
- Jun 15 Carlisle D Graham survives 2nd ride in a barrel down Niagara Falls
- Jun 15 NY Giants beat Philadelphia Phillies 29-1
- Jun 15 Stanley's expedition reaches Yambuya waterfalls Congo
- Jun 18 The Reinsurance Treaty between Germany and Russia is signed
Golden Jubilee of Queen Victoria
Jun 21 Britain celebrates the golden jubilee of Queen Victoria
- Jun 28 MLB Philadelphia Quakers (later Phillies) win most lopsided shut-out in franchise history, 24-0, over Hoosiers at Seventh Street Ballpark in Indianapolis, Indiana
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