Dr. Nelson, surgeon of the Champion, and Captain van Tromp, her skipper, came in together, and were greeted with delight by Mike.  Jubal was pleased, too, as it gave the boy something to do, under the cameras, instead of just sitting still like a dummy.  Jubal made use of the disturbance to rearrange the seating since there was now no longer any need to surround the Man from Mars with a bodyguard.  He placed Mike precisely opposite the Secretary General's chair and himself took the chair on Mike's left - not only to be close to him as his counsel but to be where he could actually touch Mike inconspicuously.  Since Mike had only the foggiest notions of human customary manners, Jubal had arranged with him signals as imperceptible as those used by a rider in putting a high-schooled horse through dressage maneuvers-"stand up," "sit down," "bow," "shake hands"-with the difference that Mike was not a horse and his training had required only five minutes to achieve utterly dependable perfection.