Throughout the Martians’ time on Earth, one consistent element of their engines and machines has been the presence of green smoke or flame, and flashes of green light. A distinctive property of the cylinders as they fell to Earth was the trail of green vapour they left as they passed through our atmosphere, and as has been mentioned previously, flashes of green light and clouds of green smoke have been associated with their industrial activities. This green gas has been labelled viridigen. As noted before, it has the peculiar property that, when subjected to an electric current, it undergoes expansion. It seems that the individual particles of the vapour become highly charged, repelling each other with great force, and fluorescing at the same time. A subsequent property of this relationshi