If you've seen any of Georges Melies films there probably isn't anything here that you haven't seen before and, apart from one brief sequence, this film is pretty dull as a result.
The film takes place in an underground cavern where a skeletal demon amuses himself by conjuring up a couple of hypnotised girls whom he wraps in plastic sheet before levitating them. The sheets burst into flames as they hover before the demon makes them disappear. A good spirit then appears to repeatedly spoil the demon's fun. This goes on for the best part of ten minutes and, to be honest, it gets a little tedious after a while.
The one good sequence comes when the demon places three jars on a table then carries the table towards the camera. It's an unusual shot for 1907 and is quite effective - as is the demon's make-up.