One of those tasks that I've been meaning to get to for awhile now is to add Bibliodyssey to my Blogroll. PK, the creator of the blog, posts images from old manuscripts from libraries around the world, which sounds far less fascinating than it actually is.
I couldn't resist this image out of the July 26th entry, which is from the1916 American Clown booklet of the title, part of a series of "Illustrated Athletic Dances for Boys and Girls" by the Athletic Dance Press of Milwaukee. The American Clown Dance is written for men and boys, so if girls take part the booklet instructs that "the leap frog and roll may be eliminated" and offers a substitute step appropriate for girls.
The Athletic Dance Press also published "Alabama Scare Crow: Eccentric Novelty Dance for Boys or Girls," "Amazon Triumph: A Spectacular Group Dance for Older Girls," and "American Farmer: A Character Dance for Boys or Girls" among many others (that list of titles is from Booknear.com). The American Clown booklet has an order form for those and additional dance booklets on page 11.
Other Bibliodyssey posts include images from old medical journals (the one below is from an Oxford University folio showing the veins, "produced in the late 13th century in England"), astrology, and much more. It's one of those sites you can get lost in for hours, even without following the links to other fascinating sites.