The little platform under his feet started acting up again in the queerest manner. It pushed him forward and the wall at the rear kicked him in the back; his nose flattened against the sliding cylinder in front as the contraption reverted from the perpendicular course to something like the undulations of a traveling wave. Lee darkly perceived group after group of luminous cables coiling away into cavernous pits filled with what looked like eyes of cats, faintly aglow and twinkling at him from the dark. They reminded him of the fireflies of the green hells he had been in during the war. "You are now skirting the convolutions of the cerebellum," his guardian angel told him. "They are electronic tubes which receive sensory impressions and translate them into impulses for cerebration. Here in the cerebellum the bulk of the associations is being evoked; these are then distributed throughout the hemispheres of the cortex or higher brain. Oh I _do_ wish you wouldn't get seasick, Dr. Lee; _some_ of our visitors do, you know; it's those wavy, wavy movements." The sympathetic Vivian came much too close to the truth for Lee to think her funny. With a sense of approaching disaster he stared at the sliding cylinder walls; from time to time the passing lights reflected his face, distorted and decidedly greenish in tint. Trouble was that seemingly nowhere there was any fixed point on which to stabilize the eye. He seemed to be carried on the back of a galloping boa constrictor with a couple of others streaking away under his armpits. Some of the caves which he had skirted were alive with ruby electronic eyes and some were green and again there were others in which all the colors of the rainbow mixed. There was no end to them, nor could he gauge their depths. After an interminable time of this the glideway went into a flying upward leap. Again the perspective changed completely; now the thing seemed to be suspended from the ceiling with slanting views opening toward the scene below through its transparent sides. "You are now passing across the commissures into the cerebrum," came Vivian's voice just as Lee thought that nausea was getting the better of him. "You'll now ascend along one of the main gyri through the mid-brain between the hemispheres. Those masses of ganglions below and coming from all sides as they go over the pass of the ridge are association bundles. Beyond they disperse again over the cortex mantle to all the centers of coordination, higher cerebration and higher psychic activities. Things will be a little easier now for you, Dr. Lee; physically I mean. There _will_ be some gyrations but not quite so _violent_. Oh you're holding out fine, like a real _He_-man, you're looking _swell_ in my television screen."