"You have already seen the workings of the net. It was the device of green fire that brought you here. The use of the net was a vital part of my plans, for without the use of a physical body from some world in your universe I could not hope to live longer than a few minutes after leaving Xollar via the inter-dimensional gate. The inherent characteristics and basic elements of your galaxy and the Andromedan universe are so different in every way that an inhabitant of either star-group cannot exist in the other. Xollar's purple atmosphere is characteristic of Andromedan worlds. Your oxygen-saturated air is typical of worlds in your galaxy. Just as Xollar's purple mists would be immediately fatal to you, so would your clear oxygen-tainted air be quickly fatal to me. * * * * * "Accordingly, my only chance of surviving in one of your worlds is to first transfer my Intelligence to the body of one of the dwellers upon that planet. Of the seven planets within reach of my net I found only two that promised to be at all suitable. One was your Earth, the other a minor planet circling the star you call Vega. I brought both you and a net-load of Vegans here to this oxygen-filled enclosure I had already prepared. "The Vegans were the headless things with the jelly nuclei. I watched your battle with them, and waited to choose as my vehicle the planetary type that proved the stronger. You vanquished the Vegans, so it is in the body of an Earthling that I shall leave Xollar, and it is to the planet Earth that I shall be hurtled through the inter-dimensional gate. "Aside from the slight difficulty caused by having to keep my body and yours each in its proper element during the operation, the matter of transfer into one of your bodies is a simple one. It involves none of the clumsy brain surgery of your Earthly science. We of Xollar have found that the real Intelligence of a being is an invisible force not at all dependent for existence upon the protoplasm through which it manifests. My Intelligence can function quite as well in your brain cells as in my own. "I require no assistant in the transfer." Zehru indicated an intricate piece of apparatus on the platform behind him. It was a massive cylinder of fluorescent metal, with two long metallic cables running from its center, each cable ending in a saucer-shaped disk. * * * * * "I have only to thrust one cable through the force-wall into your enclosure and place its disk upon one of your heads, then place the other disk upon my own head. The apparatus is entirely automatic. Three seconds after both disks are in place my Intelligence will course into the Earthling brain, driving out his Intelligence and destroying it as mine enters.