turned his head groggily and looked up into a double row of saw-edged teeth surmounted by a leering triangle of eyes. A drop of viscid drool splattered moistly on his forehead, and as the awful face above him bent closer to his own, he fainted.

The Zark snapped its jaws disapprovingly. This was not the proper attitude to take in the presence of a ferocious monster. One simply didn't go to sleep. One should attempt to run. The biped's act was utterly illogical. It needed investigation.

Curiously, the Zark sent out a pseudopod of its substance through the open mouth of its disguise. The faintly glittering thread oozed downward and struck Albert's head beside his right eye. Without pausing, the thread sank through skin and connective tissue, circled the eyeball and located the optic nerve. It raced inward along the nerve trunk, split at the optic chiasma, and entered the corpora quadrigemina where it branched into innumerable microscopic filaments that followed the main neural paths of the man's brain, probing the major areas of thought and reflex.

The Zark quivered with pleasure. The creature was beautifully complex, and, more important, untenanted. He would make an interesting host.

The Zark didn't hesitate. It needed a host; giving its present mass of organic matter pseudo-life took too much energy. The Bandersnatch collapsed with a faint slurping sound. A blob of iridescent jelly flowed from the mouth and spread itself evenly over Albert's body in a thin layer. The jelly shimmered, glowed, disappeared inward through Albert's clothing and skin, diffusing through the subcutaneous tissues, sending hair-like threads along nerve trunks and blood vessels until the threads met other threads and joined, and the Zark became a network of protoplasmic tendrils that ramified through Albert's body.

Immediately the Zark turned its attention to the task of adapting itself to its new host. Long ago it had learned that this had to be done quickly or the host did not survive. And since the tissues of this new host were considerably different from those of the Bandersnatch, a great number of structural and chemical changes had to be made quickly. With some dismay, the Zark realized that its own stores of energy would be insufficient for the task. It would have to borrow energy from the host—which was a poor way to start a symbiotic relationship. Ordinarily, one gave before taking.

Fortunately, Albert possessed considerable excess fat, an excellent source of energy whose removal would do no harm. There was plenty here for both Albert and itself. The man's body twitched and jerked as the Zark's protean cells passed through the adaptive process, and as the last leukocyte recoiled from tissue that had suddenly become normal, his consciousness returned. Less than ten minutes had passed, but they were enough. The Zark was safely in harmony with its new host.

Albert opened his eyes and looked wildly around. The landscape was empty of animate life except for the odorous carcass of the Bandersnatch lying beside him. Albert shivered, rose unsteadily to his feet and began walking toward Vaornia. That he didn't run was only because he couldn't.

He found it hard to believe that he was still alive. Yet a hurried inspection convinced him that there wasn't a tooth mark on him. It was a miracle that left him feeling vaguely uneasy. He wished he knew what had killed that grinning horror so opportunely. But then, on second thought, maybe it was better that he didn't know. There might be things in the Devan Forest worse than a Bandersnatch.

Inside the city walls, Vaornia struck a three-pronged blow at Albert's senses. Sight, hearing and smell were assaulted simultaneously. Natives slithered past, garbed in long robes of garish color. Sibilant voices cut through the evening air like thin-edged knives clashing against the grating screech of the ungreased wooden wheels of dak carts. Odors of smoke, cooking, spices, perfume and corruption mingled with the all-pervasive musky stench of unwashed Vaornese bodies.

It was old to Albert, but new and exciting to the Zark. Its taps on Albert's sense organs brought a flood of new sensation the Zark had never experienced. It marveled at the crowded buildings studded with jutting balconies and ornamental carvings. It stared at the dak caravans maneuvering with ponderous delicacy through the swarming crowds. It reveled in the colorful banners and awnings of the tiny shops lining the streets, and the fluttering robes of the natives. Color was something new to the Zark. Its previous hosts had been color blind, and the symbiont wallowed in an orgy of bright sensation.

If Albert could have tuned in on his fellow traveler's emotions, he probably would have laughed. For the Zark was behaving precisely like the rubbernecking tourist he himself was pretending to be. But Albert wasn't interested in the sights, sounds or smells, nor did the natives intrigue him. There was only one of them he cared to meet—that slimy doublecrosser called Shifaz who had nearly conned him into a one-way ticket.

Albert plowed heedlessly through the crowd, using his superior mass to remove natives from his path. By completely disregarding the code of conduct outlined by the IC travel bureau, he managed to make respectable progress toward the enormous covered area in the center of town that housed the Kazlak, or native marketplace. Shifaz had a stand there where he was employed as a tourist guide.

The Zark, meanwhile, was not idle despite the outside interests. The majority of its structure was busily engaged in checking and cataloguing the body of its host, an automatic process that didn't interfere with the purely intellectual one of enjoying the new sensations. Albert's body wasn't in too bad shape. A certain amount of repair work would have to be done, but despite the heavy padding of fat, the organs were in good working condition.

The Zark ruminated briefly over what actions it should take as it dissolved a milligram of cholesterol out of Albert's aorta and strengthened the weak spot in the blood vessel with a few cells of its own substance until Albert's tissues could fill the gap. Its knowledge of human physiology was incomplete, but it instinctively recognized abnormality. As a result, it could help the host's physical condition, which was a distinct satisfaction, for a Zark must be helpful.

Shifaz was at his regular stand, practicing his normal profession of guide. As Albert approached, he was in the midst of describing the attractions of the number two tour to a small knot of fascinated tourists.

"And then, in the center of the Kazlak, we will come to the Hall of the Brides—Antar's greatest marriage market. It has been arranged for you to actually see a mating auction in progress, but we must hurry or—" Shifaz looked up to see Albert shouldering the tourists aside. His yellow eyes widened and his hand darted to his girdle and came up with a knife.

The nearest tourists fell back in alarm as he hissed malevolently at Albert, "Stand back, Earthman, or I'll let the life out of your scaleless carcass!"

"Doublecrosser," Albert said, moving in. One meaty hand closed over the knife hand and wrenched while the other caught Shifaz alongside the head with a smack that sounded loud in the sudden quiet. Shifaz did a neat backflip and lay prostrate, the tip of his tail twitching reflexively.

One of the tourists screamed.

"No show today, folks," Albert said. "Shifaz has another engagement." He picked the Antarian up by a fold of his robe and shook him like a dirty dustcloth. A number of items cascaded out of hidden pockets, among which was an oiled-silk pouch. Albert dropped the native and picked up the pouch, opened it, sniffed, and nodded.

It fitted. Things were clearer now.

He was still nodding when two Earthmen in IC uniform stepped out of the crowd. "Sorry, sir," the bigger of the pair said, "but you have just committed a violation of the IC-Antar Compact. I'm