I may as well premise, however, that it does not seem to me worth while to enter here at any length into Swedenborg's descriptions of the inhabitants of other worlds, because what he has to say on this subject is entirely imaginative. There is a real interest for us in his ideas respecting the condition of the planets, because those ideas were based (though unconsciously) upon the science of his day, in which he was no mean proficient. And even where his mysticism went beyond what his scientific attainments suggested, a psychological interest attaches to the workings of his imagination. It is as curious a problem to trace his ideas to their origin as it sometimes is to account for the various phases of a fantastic dream, such a dream, for instance, as that which Armadale, the doctor, and Midwinter, in 'Armadale,' endeavour to connect with preceding events. But Swedenborg's visions of the behaviour and appearance of the inhabitants of other earths have little interest, because it is hopeless to attempt to account for even their leading features. For instance, what can we make of such a passage as the following, relating to the spirits who came from Mercury?--'Some of them are desirous to appear, not like the spirits of other earths as men, but as crystalline globes. Their desire to appear so, although they do not, arises from the circumstance that the knowledges of things immaterial are in the other life represented by crystals.' Yet some even of these more fanciful visions significantly indicate the nature of Swedenborg's philosophy. One can recognise his disciples and his opponents among the inhabitants of various favoured and unhappy worlds, and one perceives how the wiser and more dignified of his spiritual visitors are made to advocate his own views, and to deride those of his adversaries. Some of the teachings thus circuitously advanced are excellent.