James Chadwick, English physicist, dies 

A six-year-old girl became the first patient to be successfully treated with insulin, at Guy's Hospital, London, UK 

Hiram Bingham discovers Lost City of the Incas 

Cleves League Park hosts 1st unofficial ML All Star game (benefit game for Addie Joss family). Cleveland Naps lose to All Stars 5-3 

Bkln Dodger Nap Rucker strikes out 16 Pitts Pirates 

Race riot in New Orleans, 2 white policemen kills