All of which was, of course, vastly interesting to him, since what he heard to-day would be a splendid guidance for him as to his future progress southwards to Rotterdam. Nicolaes Beresteyn leading an expedition of raw recruits in the pursuit of his sister was a subject humorous enough to delight the young adventurer's sense of fun; moreover it was passing lucky that suspicion had at once fallen on the sea-wolves--a notorious band of ocean pirates whose acts of pillage and abduction had long since roused the ire of all northern cities that suffered from their impudent depredations. Diogenes congratulated himself on the happy inspiration which had caused him to go out of Haarlem by its north gate and to have progressed toward Groningen for a quarter of an hour or so, leaving traces behind him which Nicolaes Beresteyn would no doubt know how to interpret in favour of the "sea-wolves" theory. He could also afford to think with equanimity now of Pythagoras and Socrates in charge of the jongejuffrouw lying comfortably perdu at a wayside inn, situated fully thirteen leagues to the south of the nearest inland lair, which was known to be the halting place of the notorious sea-robbers. Indeed, his act of friendship in devoting his day to the interests of Frans Hals had already obtained its reward, for he had gathered valuable information, and his journey to Rotterdam would in consequence be vastly more easy to plan. No wonder that Frans Hals as he worked on the picture felt he had never had such a sitter before; the thoughts within redolent of fun, of amusement at the situation, of eagerness for the continuation of the adventure seemed to bubble and to sparkle out of the eyes, the lines of quiet humour, of gentle irony, appeared ever mobile, ever quivering around the mouth. For many hours that day hardly a word passed between the two men while the masterpiece was in progress, which was destined to astonish and delight the whole world for centuries to come. They hardly paused a quarter of an hour during the day to snatch a morsel of food; Hals, imbued with the spirit of genius, begrudged every minute not spent in work and Diogenes, having given his time to his friend, was prepared that the gift should be a full measure. Only at four o'clock when daylight faded, and the twilight began to merge the gorgeous figure of the sitter into one dull, grey harmony, did the artist at last throw down brushes and palette with a sigh of infinite satisfaction. "It is good," he said, as with eyes half-closed he took a final survey of his sitter and compared the living model with his own immortal work. "Have you had enough of me?" asked Diogenes. "No. Not half enough. I would like to make a fresh start on a new portrait of you at once. I would try one of those effects of light of which Rembrandt thinks that he hath the monopoly, but which I would show him how to treat without so much artificiality."