The letter came down the slot too early that morning to be the regular mail run. Pete Greenwood eyed the New Philly photocancel with a dreadful premonition. The letter said:

PETER: Can you come East chop-chop, urgent? Grdznth problem getting to be a PRoblem, need expert icebox salesman to get gators out of hair fast. Yes? Math boys hot on this, citizens not so hot. Please come. TOMMY

Pete tossed the letter down the gulper with a sigh. He had lost a bet to himself because it had come three days later than he expected, but it had come all the same, just as it always did when Tommy Heinz got himself into a hole.

Not that he didn't like Tommy. Tommy was a good PR-man, as PR-men go. He just didn't know his own depth. PRoblem in a beady Grdznth eye! What Tommy needed right now was a Bazooka Battalion, not a PR-man. Pete settled back in the Eastbound Rocketjet with a sigh of resignation.

He was just dozing off when the fat lady up the aisle let out a scream. A huge reptilian head had materialized out of nowhere and was hanging in air, peering about uncertainly. A scaly green body followed, four feet away, complete with long razor talons, heavy hind legs, and a whiplash tail with a needle at the end. For a moment the creature floated upside down, legs thrashing. Then the head and body joined, executed a horizontal pirouette, and settled gently to the floor like an eight-foot circus balloon.

Two rows down a small boy let out a muffled howl and tried to bury himself in his mother's coat collar. An indignant wail arose from the fat lady. Someone behind Pete groaned aloud and quickly retired behind a newspaper.

The creature coughed apologetically. "Terribly sorry," he said in a coarse rumble. "So difficult to control, you know. Terribly sorry...." His voice trailed off as he lumbered down the aisle toward the empty seat next to Pete.

The fat lady gasped, and an angry murmur ran up and down the cabin. "Sit down," Pete said to the creature. "Relax. Cheerful reception these days, eh?"

"You don't mind?" said the creature.

"Not at all." Pete tossed his briefcase on the floor. At a distance the huge beast had looked like a nightmare combination of large alligator and small tyrannosaurus. Now, at close range Pete could see that the "scales" were actually tiny wrinkles of satiny green fur. He knew, of course, that the Grdznth were mammals--"docile, peace-loving mammals," Tommy's PR-blasts had declared emphatically--but with one of them sitting about a foot away Pete had to fight down a wave of horror and revulsion.

The creature was most incredibly ugly. Great yellow pouches hung down below flat reptilian eyes, and a double row of long curved teeth glittered sharply. In spite of himself Pete gripped the seat as the Grdznth breathed at him wetly through damp nostrils.

"Misgauged?" said Pete.

The Grdznth nodded sadly. "It's horrible of me, but I just can't help it. I _always_ misgauge. Last time it was the chancel of St.