"So did we, when it was used on us," Kinnison grinned and went off to explain the origin of the primary. "But before we go into details, I noticed that your fixed-mount stuff could not work effectively through atmosphere. We have what we call Q-type helices, with which we incase such beams so that they work in a tube of vacuum. We will give you the Q-formulæ and also the working hookup--including the protective devices, because they're mighty dangerous without plenty of force-backing--of the primaries, in exchange for some lessons in power-plant design." "Such an exchange of knowledge would be helpful indeed," Wise agreed. "The Boskonians know nothing whatever of this beam, and we do not want them to learn of it," Kinnison cautioned. "Therefore I have two suggestions to make. First, that you try everything else before you use this primary beam. Second, that you don't use it even then unless you can wipe out, as nearly simultaneously as we did out there, every Boskonian who may be able to report back to his base as to what really happened. Fair enough?" "Eminently so. We agree without reservation--it is to our interest as much as yours that such a secret be kept from Boskone." "QX. Fellow, let's go back to the ship for a couple of minutes." Then, aboard the _Dauntless_: "Tregonsee, you and your crew want to stay with the planet, to show the Medonians what to do and to help them along generally, as well as to learn about their power system. Thorndyke, you and your gang, and probably Lensman Hotchkiss, had better study these things, too--you'll know what you want as soon as they show you the hookup. Worsel, I'd like to have you stay with the ship. You're in command of her until further orders. Keep her here for, say, a week or ten days, until the planet is well out of the Galaxy. Then, if Hotchkiss and Thorndyke haven't got all the dope they want, leave them here to ride back with Tregonsee on the planet and drill the _Dauntless_ for Tellus. Keep yourself more or less disengaged for a while, and sort of keep tuned to me. I may not need an ultra-long-range communicator, but you never can tell." "Why such comprehensive orders, Kim?" asked Hotchkiss. "Who ever heard of a commander abandoning his expeditions? Aren't you sticking around?" "Nope--got to do a flit. Think maybe I'm getting an idea. Break out my speedster, will you, Allerdyce?"--and the Gray Lensman was gone. V. Kinnison's speedster shot away and made an undetectable, uneventful voyage back to the Earth. In due time, therefore, the Gray Lensman was again closeted with Port Admiral Haynes. "Why the foliage?" the chief of staff asked, almost at sight, for the Gray Lensman was wearing a more-than-half-grown beard. "I may need to be Chester Q. Fordyce for a while. If I don't, I can shave it off quick. If I do, a real beard is a lot better than an imitation," and he plunged into his subject.