One of the most novel effects that has come to my attention is that which follows. True, it is a principle which is neither new nor original, but the application makes it something that will be of interest whenever shown, and allows of not a little histrionic byplay. Mr Robson has long been noted for his ghost stories and horror tales under green lights and such so this emanation from an imaginative brain is excusable. Certainly the variation will be remembered above other forms of the principle. You have six small cards like those illustrated and on which are printed…