Jimmie (I & VI) thought that witches were a real threat so he wrote a book.
Demonology, by King James I
The Squire in _Mist Over Pendle_ by Robert Neill had bought a copy.
http://www.amazon.com/gp/product/B00S5EAR60/
http://www.amazon.co.uk/gp/product/B00S5EAR60/
http://www.amazon.ca/gp/product/B00S5EAR60/