Invention of logarithms by Lord Napier, England.

1615. Marriage of Louis XIII with Anne of Austria, daughter of Philip III of Spain.

At Frankfort-on-the-Main is published the first known weekly newspaper.

1616. Beginning of war between Sweden and Poland.

Discovery of the circulation of the blood by Harvey. See "Harvey Discovers the Circulation of the Blood," xi, [50].

Exploration of the bay, to which his name has been given, by Baffin.

Death of Shakespeare and Cervantes.

1617. Assassination of Maréschal d'Ancre, favorite of Marie de' Medici; Marie is exiled.

Peace of Stolbova between Russia and Sweden; territory on the Baltic ceded to Sweden.

1618. Execution of Raleigh.