What condition should be fulfilled by Ben in the same place as told by him to Jim? In Treasure Island

From the text:

“And when Ben Gunn is wanted, you know where to find him, Jim. Just wheer you found him today. And him that comes is to have a white thing in his hand, and he's to come alone. Oh! And you'll say this: 'Ben Gunn,' says you, 'has reasons of his own.'”

“Well,” said I, “I believe I understand. You have something to propose, and you wish to see the squire or the doctor, and you're to be found where I found you. Is that all?”

“And when? says you,” he added. “Why, from about noon observation to about six bells.”