Lessing has advanced excellent reasons for supposing that the Martians have actually succeeded in effecting a landing on the planet Venus. Seven months ago now, Venus and Mars were in alignment with the sun; that is to say, Mars was in opposition from the point of view of an observer on Venus. Subsequently a peculiar luminous and sinuous marking appeared on the unillumined half of the inner planet, and almost simultaneously a faint dark mark of a similar sinuous character was detected upon a photograph of the Martian disk. One needs to see the drawings of these appearances in order to appreciate fully their remarkable resemblance in character.