Spriggans are sprites local to Cornwall. They are often described as hideous creatures that like to cause havoc.
The seal-women are Selkies, shapeshifting mythical creatures that can shed their seal skins and become human. But if someone steals their pelts then they are trapped in their human form. This is a variant of the swan maiden myths.
Knockers live below ground and look like little miners. They knock on the walls of mines. They are Welsh and Cornish in origin, and some see them as mischief-makers where others consider them harmless practical jokers. English Brownies and Irish Leprechauns are comparable.
Blue-caps are similar to Knockers, but they are benevolent and forwarn people about cave-ins. They show miners where rich deposits can be found, as long as they are treated with respect.
The Bucca appears in Cornish folklore as a creature that lives in mines. It is thought to have once been an ancient god of the sea. There were two forms of the Bucca: Bucca Widn, the white Bucca, and Bucca Dhu, the black Bucca.
The Bucca was also believed to cause storms.
Apple Tree Wassail by the Watersons
Bread and salt appear in many cultures as symbols of luck and hospitality.
Cousin Jack is a name for Cornish emigrants.
Cousin Jacks were firm believers in the Knockers.
Lines by W E Henley, a poet, editor and critic.
Charles Atlas was a famous body builder, who developed and marketed his own methods and was very popular in his day.