More on whistling in China. The 啸旨 Xiao zhi, Principles of Whistling, is a method book for Daoist transcendental whistling. It's a rare how-to for summoning spirits and controlling nature. Or maybe it's just a book of tunes. I'm not quite sure. Please use it with caution; there's dragons and phoenixes and demons involved. It was translated and commented on by a woman named Evangeline Dora Edwards (1888-1957).

https://en.wikipedia.org/wiki/Evangeline_Edwards

https://en.wikipedia.org/wiki/Transcendental_whistling

In the podcast I forgot to tell you what a li (里). A li was a measure of distance in China. It's about a third of a mile.