1911 Encyclopædia Britannica (1911)
“ In the middle ages the Whitsun services were marked by many curious customs. Among these described by Durandus (Rationale div. off. vi. 107) are the letting down of a dove from the roof into the church, the dropping of balls of fire, rose-leaves and the like. Whitsun is one of the Scottish quarter-days, and though the Church festival is movable, the legal date was fixed for the 15th of May by an act of 1693. ”
