Walpurgisnacht, 1897 by the Swiss painter Albert Welti (February 18, 1862 – June 7, 1912)The witches fly and tumble on Walpurgis Night.
See the posting at <http://sexywitch.wordpress.com/2007/04/14/weltis-walpurgisnacht-1897/> For more on the artist, see <http://en.wikipedia.org/wiki/Albert_Welti>