Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 144.

Jokkmokk [2], 19/07/1732, ¶756:

Reindeer also suffer from dizziness that causes them to wander in circles. People say that those that proceed clockwise will recover whereas those that go anti-clockwise are killed immediately as it is claimed that they will never recover. The ears of the recovering animals are slit and allowed to bleed copiously.