Jackson's eyes were frightened. "You mean it's contagious?"

"I don't know, of course," Randall answered. "We'll see what Dr. Gerard

has to say."

Within a few moments, the three men joined Lanson and Dr. Gerard

outside Zor Ala's hut.

"What do you think, Doc?" asked Randall.

"Can't tell for sure," Gerard replied. "My medical knowledge is

definitely limited. Furthermore, I have no equipment to make tests, but

my diagnosis is meningococcus--cerebrospinal meningitis."

"Well, will the rest of us get it?" asked Jackson, edging away from

the men who had been in Zor Ala's shelter.

"Could be," said Dr. Gerard seriously. "We'll have to keep him

isolated, but I'm afraid some of us have already been exposed. We may

have real trouble on our hands."

"What's the remedy?" inquired McClellan.

"Well, sulfonilamide, if we had it," replied Dr. Gerard. "But we don't

have any medicine at all."

"What--what will we do?" asked Jackson apprehensively.

The doctor shrugged. "If I had access to a chemical laboratory," he

said, "I could synthesize some sulfa, but I doubt if the Kralons would

let me use theirs."

"They might, at that," said Randall, watching Jackson out of the corner

of his eye, "If they knew an epidemic might wipe out their entire

colony of humans after all the work they've done in getting them from

the future."

"Maybe they would," said Jackson eagerly. "Should I talk to them about

it?"

"Couldn't hurt anything," replied Randall casually. "And it might help."

Together the group made its way to the locked gate in the stockade

wall. There they set up a disturbance until a Kralon guard came and

unlocked the gate. At the same time the speaker blared: "One human will

follow."

Jackson stepped out from the group and followed the Kralon down the

path and into the Hive.

"Do you really think the Kralons will let us have access to their

chemical laboratory?" asked McClellan.

Randall shrugged. "They might," he said, "if Jackson is convincing

enough. I know they don't want to lose all their human guinea pigs."

In less than an hour Jackson was back. "The Kralons said that Dr.

Gerard could use the laboratory," he said. "And I'm to help him with

his work."

"Okay," said the doctor briskly. "We'd better hurry."

Together, the two men followed the guide back to the Hive.

A few moments later, Randall, McClellan and Lanson joined Malherne in

Lanson's hut. They seated themselves before the crude desk with its

pile of figured sheets.

"How does it look?" asked Randall.

"Very good," replied the physicist. "Malherne has checked my figures

and they are apparently all right."

"Just how does it all stack up?" asked McClellan.

Lanson ran a hand through his bristling thatch. "Well," he said, "In

the first place, from my computations it seems quite apparent that if

we reverse the current through the mosaic mesh of the screen above the

Time Net, the Teleomagnetic flux should create a stress in the opposite

direction to that induced by the Kralons. Thus, theoretically, the

direction of the Teleomagnetic or gravitic displacement, acting on

anyone in the net, should be forward in Time, rather than backward."

"How about selecting the proper spot in Time?" asked McClellan.

"That is accomplished by the amount of energy, figured in Teleomagnetic

magnetons, and interpolated to dynes required to produce a given Time

displacement or warp," he answered.

"How about conversion to your system of the readings on the Kralon

indicators and instruments?" asked Randall.

Lanson held up a flashlight which one of the humans had had among his

possessions. "By checking the standard output of a dry cell against the

instruments, and computing the indicator readings in our own terms," he

replied.

Randall nodded. "Looks as if you have done quite a thorough job," he

agreed. "Now, if Dr. Gerard can do his stuff we may have a chance."

* * * * *

In the laboratory of the Kralons, Dr. Gerard was having his troubles.

The various containers and their enigmatic labels were of course

entirely foreign to him, and it was necessary for him to start a

basic qualitative analysis, without knowing one reagent from another.

However, it wasn't too difficult for him to qualitatively identify

sulfuric acid and a few other basic chemicals, and from then on his

task was easier.

Jackson was a surprisingly good assistant, although he bothered Dr.

Gerard frequently with questions about the degree of contagion of

meningitis.

The doctor did nothing to ameliorate his fear. Rather he spurred

Jackson to increased effort by conjecturing upon the havoc the disease

could wreak if it reached epidemic proportions.

Twice he called upon the Kralons for more reagents and chemicals. The

third time he was questioned at length concerning the quantity he was

using.

His explanation was the admission of difficulty in reconciling his

own and the Kralon terminology for materials. Thus it was easy to

understand, he explained carefully, why he had inadvertently wasted

several batches.

But all the time the quantity of white powder in a large cask in one

corner of the room was growing steadily. When the cask was finally

full, Dr. Gerard called a halt to their labor of synthesis.

"Seems as though that should be enough for an army," remarked Jackson,

examining the huge container full of the chemical powder.

"May have to use it on about that many," replied Dr. Gerard brusquely.

While Jackson was busy filtering and running the last batch, Dr. Gerard

had fabricated a Venturi tube and a spray nozzle from odds and ends

of laboratory equipment. Working rapidly, he filled a large metal

container with powder from the cask, then added enough liquid to fill

the cask and to dissolve its contents.

Then, with Jackson's help, he moved the cask over beside the air return

of the air conditioning and recirculating system for the Hive. He

pulled a small table over beside the cask, clamped the Venturi tube

and spray nozzle in place, with the nozzle pointing into the return

duct. Then he connected a hose from the laboratory water system to the

Venturi, and a return hose back to the drain.

The spray worked beautifully, vaporizing the solution and spraying it

as a fine mist into the air return duct.

"What's that for?" asked Jackson suspiciously.

"Just arranging decontamination for the Hive so that it'll be safe for

us to come here."

Jackson looked at Gerard sharply, but didn't say anything.

It was evening again by this time, and Gerard asked Jackson to see

whether the Kralons had some kind of portable lighting equipment, so

that he could see to minister to Zor Ala and any others who might need

attention.

While Jackson was gone, Dr. Gerard pulled a large carton over in

front of his spray system, hiding it quite effectively from casual

inspection. He closed the entrance panel, carefully inserting a wedge

of metal in the guide which jammed it as it closed.

Then he started down the hall with a container of powder under his

arm. Jackson met him in the corridor. The salesman was carrying

two transparent globular jars slung from handles. The globes were

apparently filled with highly phosphorescent matter, for they gave

almost as much light as a lantern.

"How will these do?" Jackson asked.

"Fine," said Dr. Gerard heartily. "Now let's get going."

Back in the stockade a few minutes later he left Jackson with a hurried

excuse, conferred briefly with Randall, then went to Lanson's shelter.

By this time things were beginning to add up in Jackson's rather

sluggish mental processes, and they didn't come out even. Thoroughly

he turned the whole sequence of events over in his mind, reached a

decision, then decided to wait until the rest of the human colony had

retired for the night, before making a move.

* * * * *

A little later Randall, McClellan, Gordo Lanson, Dr. Gerard and

Malherne were gathered in Zor Ala's hut for a final council meeting to

outline timing and strategy for their next moves.

"Remarkable recovery you made, sir," McClellan told Zor Ala with a grin.

The future-man smiled. "Yes," he said. "I believe that Dr. Gerard's

medication is quite effective. It's made me feel much better already,

even though it's the Kralons rather than I who are taking it!"

Then he turned to the little investigation agent. "Neat idea of yours,

Randall, of synthesizing D.D.T. to fight the Kralons."

"D.D.T.?" asked Malherne, who had not been a member of this particular

phase of the intrigue. "What's that?"

"Dichloro-diphenyl-trichlorethane, to use the generic term for the

chemical," replied Dr. Gerard. "It's a chemical insecticide that's

quite specific for most insects."

"Oh," said the engineer in comprehension. "That's what you were

synthesizing instead of sulfonilamide!"

"Right," said the little doctor. "But it _is_ a remedy for our

troubles, we hope," he added in defense of the deceit they had

practiced.

The group chuckled at Gerard's righteousness, even in dealing with

inhuman monsters.

"How long do you think it will take for the chemical to have a material

effect on the Kralons?" inquired Lanson.

"Shouldn't be too long," interposed Dr. Gerard. "Unlike the insects of

our own times, these creatures have had no opportunity to build up an

immunity, nor time to mutate as a race to types resistant to chemical

insecticides. Therefore its effect should be considerably more rapid

than upon even the small insects of the future."

Zor Ala nodded in satisfaction. "The floor is yours, Randall," he said.

Randall stepped to the center of the group. "We are apparently all

in agreement that the zero hour is to be set at 4:00 AM, or 1600

in universal time. That should give sufficient time for the DDT to

accomplish its work, and we do not dare delay beyond then for fear

that Dr. Gerard's contrivance will be discovered in the morning, thus

alerting the Kralons."

He paused a moment, his pale gray eyes flicking from one member of the

group to another. "It might be wise to keep an eye on Jackson in the

meantime," he said. "He undoubtedly has had time to think things over,

and to have concluded that Dr. Gerard's fake synthesis and subsequent

actions weren't quite plausible under the circumstances."

"How did you happen to suspect him in the first place?" asked McClellan.

Randall smiled faintly. "It was quite obvious that the salesman lacked

courage," he replied. "We all were fully aware of that. Also, both by

profession and inclination, Jackson was an opportunist.

"In my dealings with the renegades of society, I have always found that

to be a deadly combination. A cowardly opportunist can almost always

be expected to turn traitor to a cause which offers him any particular

inconvenience. Also," he added, "the Kralons asked me several questions

about Jackson which set me thinking."

Lanson nodded. "He very clearly gave his position away when he so

willingly volunteered to contact the Kralons with our request," he

said. "We certainly have you to thank for preventing us from exposing

our plans before him. You were particularly adroit in utilizing his

treacherous contact with the Kralons to our advantage."

As the other members nodded agreement, Randall shifted uneasily. "I

didn't do much," he said briefly. "Dr. Gerard did all the work. But

the hardest part is still ahead of us. The DDT, at best, is only going

to make the Kralons lethargic and slow in the time we have allowed.

Even if they don't suspect something and vacate the Hive before the

chemical-laden air affects them adversely. In any event we will have

many problems to solve.

"Let us outline briefly the tasks assigned to each of us, and formulate

a time schedule of action, starting with 4:00 AM as the zero hour."

He turned to Zor Ala. "You are to make such contacts with the other

humans of the colony as you feel advisable, and you will organize

several parties from those you feel you can trust. Have them gather in

small groups on either side of the main gate, staying in the shadows of

the stockade wall. Be sure they are ready at one minute to four. Have

the members armed with any weapons you can devise."

Then he continued, outlining carefully the assigned plan of action and

time schedule for each individual.

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