This was a great find on the many facets of whistling. T.F. Thiselton-Dyer was a folklorist and in this paper, he talks about many things related to whistling: mythology, superstition, folklore, drinking cups, whistling competitions, drinking contests, whistling oysters and much more.

https://en.wikisource.org/wiki/Popular_Science_Monthly/Volume_23/June_1883/Whistling