21st » Ypiranga incident: A German arms shipment to Mexico is intercepted by the U.S. Navy near Veracruz, Veracruz.
23rd » First baseball game at History of Wrigley Field called Wrigley Field, then known as Weeghman Park in Chicago.
24th » The Franck–Hertz experiment, a pillar of Introduction to quantum mechanics named quantum mechanics, is presented to the Deutsche Physikalische Gesellschaft or German Physical Society.
27th » Honduras becomes a signatory to the Buenos Aires Convention known as Buenos Aires copyright treaty.