He handed his horrible hat to the astonished Moody, laid himself flat on the top of the bank, and deliberately rolled down it, exactly as he might have done when he was a boy.  The tails of his long gray coat flew madly in the wind:  the dog pursued him, jumping over him, and barking with delight; he shouted and screamed in answer to the dog as he rolled over and over faster and faster; and, when he got up, on the level ground, and called out cheerfully to his companions standing above him, “I say, you two, I feel twenty years younger already!”—­human gravity could hold out no longer.  The sad and silent Moody smiled, and Isabel burst into fits of laughter.

“There,” he said “didn’t I tell you you would get used to me, Miss?  There’s a deal of life left in the old man yet—­isn’t there?  Shy me down my hat, Mr. Moody.  And now we’ll get to business!” He turned round to the dog still barking at his heels.  “Business, Puggy!” he called out sharply, and Puggy instantly shut up his mouth, and said no more.

“Well, now,” Old Sharon resumed when he had joined his friends and had got his breath again, “let’s have a little talk about yourself, miss.  Has Mr. Moody told you who I am, and what I want with you?  Very good.  May I offer you my arm?  No!  You like to be independent, don’t you?  All right—­I don’t object.  I am an amiable old man, I am.  About this Lady Lydiard, now?  Suppose you tell me how you first got acquainted with her?”

In some surprise at this question, Isabel told her little story.  Observing Sharon’s face while she was speaking, Moody saw that he was not paying the smallest attention to the narrative.  His sharp, shameless black eyes watched the girl’s face absently; his gross lips curled upwards in a sardonic and self-satisfied smile.  He was evidently setting a trap for her of some kind.  Without a word of warning—­while Isabel was in the middle of a sentence—­the trap opened, with the opening of Old Sharon’s lips.

“I say,” he burst out.  “How came you to seal her Ladyship’s letter—­eh?”

The question bore no sort of relation, direct or indirect, to what Isabel happened to be saying at the moment.  In the sudden surprise of hearing it, she started and fixed her eyes in astonishment on Sharon’s face.  The old vagabond chuckled to himself.  “Did you see that?” he whispered to Moody.  “I beg your pardon, miss,” he went on; “I won’t interrupt you again.  Lord! how interesting it is!—­ain’t it, Mr. Moody?  Please to go on, miss.”

But Isabel, though she spoke with perfect sweetness and temper, declined to go on.  “I had better tell you, sir, how I came to seal her Ladyship’s letter,” she said.  “If I may venture on giving my opinion, that part of my story seems to be the only part of it which relates to your business with me to-day.”

Without further preface she described the circumstances which had led to her assuming the perilous responsibility of sealing the letter.  Old Sharon’s wandering attention began to wander again:  he was evidently occupied in setting another trap.  For the second time he interrupted Isabel in the middle of a sentence.  Suddenly stopping short, he pointed to some sheep, at the further end of the field through which they happened to be passing at the moment.