The 1864 Spectropia used optical illusions to manifest ghosts in Victorian homes, and was designed to attack the quackery of Spiritualism. You can read and see more here.
Look, witches were into biofuel! :D Hyperallergic has a host of entertaining vintage Halloween Cards.
On the more serious side, today marks the opening of a new exhibition of Cornell University’s Witchcraft Collection:
You can read and see much more at Hyperallergic. It’s the largest witchcraft collection in North America, and will run through August of 2018.