The Mancji whine was added to my message, and it went out. Moments later this came back:

MANCJI HONOR DICTATES YOUR SAFE-CONDUCT; TALK IS WEARYING; WE FIND IT CONVENIENT TO SOLICIT A TRANSFER OF ELECTROSTATIC FORCE.

"What the devil does that mean?" I said. "Tell them to loosen up and explain themselves."

Mannion wrote out a straight query, and sent it. Again we waited for a reply.

It came, in a long windy paragraph stating that the Mancji found electro-static baths amusing, and that "crystallization" had drained their tanks. They wanted a flow of electrons from us to replenish their supply.

"This sounds like simple electric current they're talking about, Captain," Mannion said. "They want a battery charge."

"They seem to have power to burn," I said. "Why don't they generate their own juice? Ask them; and find out where they learned Interlingua."

Mannion sent again; the reply was slow in coming back. Finally we got it:

THE MANCJI DO NOT EMPLOY Ma.s.sIVE GENERATION-PIECE WHERE ACc.u.mULATOR-PIECE IS SUFFICIENT. THIS SIMPLE TRADE SPEECH IS OF OLD KNOWLEDGE. WE SELECT IT FROM SYMBOLS WE ARE PLEASED TO SENSE EMPATTERNED ON YOUR HULL.

That made some sort of sense, but I was intrigued by the reference to Interlingua as a trade language. I wanted to know where they had learned it. I couldn't help the hope I started building on the idea that this giant knew our colony, in spite of the fact that they were using an antique version of the language, predating Omega by several centuries.

I sent another query, but the reply was abrupt and told nothing except that Interlingua was of "old knowledge."

Then Mannion entered a long technical exchange, getting the details of the kind of electric power they wanted.

"We can give them what they want, no sweat, Captain," he said after half an hour's talk. "They want DC; 100 volt, 50 amp will do."

"Ask them to describe themselves," I directed. I was beginning to get an idea.

Mannion sent, got his reply. "They're molluscoid, Captain," he said. He looked shocked. "They weigh about two tons each."

"Ask them what they eat," I said.

I turned to Joyce as Mannion worked over the message. "Get Kramer up here, on the double," I said.

Kramer came in five minutes later, looking drawn and rumpled. He stared at me sullenly.

"I'm releasing you from arrest temporarily on your own parole, Major," I said. "I want you to study the reply to our last transmission, and tell me what you can about it."

"Why me?" Kramer said. "I don't know what's going on." I didn't answer him.

There was a long tense half hour wait before Mannion copied out the reply that came in a stuttering nasal. He handed it to me.

As I had hoped, the message, after a preliminary recital of the indifference of the Mancji to biological processes of ingestion, recited a list of standard biochemical symbols.

"Can we eat this stuff?" I asked Kramer, handing him the sheet.

He studied it, and some of his accustomed swagger began to return. "I don't know what the flowery phrases are all about, but the symbols refer to common proteins, lipins, carbohydrates, vitamins, and biomins," he said. "What is this, a game?"

"All right, Mannion," I said. I was trying to hold back the excitement.

"Ask them if they have fresh sources of these substances aboard."

The reply was quick; they did.

"Tell them we will exchange electric power for a supply of these foods.

Tell them we want samples of half a dozen of the natural substances."

Again Mannion coded and sent, received and translated, sent again.

"They agree, Captain," he said at last. "They want us to fire a power lead out about a mile; they'll come in close and shoot us a specimen case with a flare on it. Then we can each check the other's merchandise."

"All right," I said. "We can use a ground-service cable; rig a pilot light on it, and kick it out, as soon as they get in close."

"We'll have to splice a couple of extra lengths to it," Mannion said.

"Go to it, Mannion," I said. "And send two of your men out to make the pick-up." This wasn't a communications job, but I wanted a reliable man handling it.

I returned to the bridge and keyed for Bourdon, directed him to arm two of his penetration missiles, lock them onto the stranger, and switch over to my control. With the firing key in my hand, I stood at the televideo screen and watched for any signs of treachery. The ship moved in, came to rest filling the screen.

Mannion's men reported out. I saw the red dot of our power lead move away, then a yellow point glowed on the side of the vast iodine-colored wall looming across the screen.

Nothing else emerged from the alien ship. The red pilot drifted across the face of the sphere. Mannion reported six thousand feet of cable out before the pilot disappeared abruptly.

"Captain," Mannion reported, "they're drawing power."

"O.K.," I said. "Let them have a sample, then shut down."

I waited, watching carefully, until Mannion reported the cannister inside.

"Kramer," I said. "Run me a fast check on the samples in that container."

Kramer was recovering his swagger. "You'll have to be a little more specific," he said. "Just what kind of a.n.a.lysis do you have in mind? Do you want a full...."

"I just want to know one thing, Kramer," I said. "Can we a.s.similate these substances, yes or no. If you don't feel like co-operating, I'll have you lashed to your bunk, and injected with them. You claim you're a medical officer; let's see you act like one." I turned my back to him.

Mannion called. "They say the juice we fed them was 'amusing,' Captain.

I guess that means it's O.K."

"I'll let you know in a few minutes how their samples pan out," I said.

Kramer took half an hour before reporting back. "I ran a simple check such as I normally use in a routine mess inspection," he began. He couldn't help trying to take the center of the stage to go into his Wise Doctor and Helpless Patient routine.

"Yes or no," I said.

"Yes, we can a.s.similate most of it," he said angrily. "There were six samples. Two were gelatinous substances, non-nutritive. Three were vegetable-like, bulky and fibrous, one with a high iodine content; the other was a very normal meaty specimen."