By the Honourable Robert Hunter Morris, Esq; lieutenant governor, and commander in chief of the province of Pennsylvania, and counties of New-Castle, Kent, and Sussex, upon Delaware, a proclamation : ... Thursday, the nineteenth day of June, to be observed ... as a day of publick humiliation, fasting and prayer. ... Given under my hand, and the great seal of the province of Pennsylvania, at Philadelphia, the sixth day of June ... one thousand seven hundred and fifty-five.