Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 57.
Västerbotten [1], 24/05/1732, ¶220:
The governor gave me a very curious piece of information about the clay among the sandhills. He said that it increases along with the waxing moon and decreases with the waning moon, so that if you dig while the moon is waxing you get clay, whereas when the moon is waning you get sand.