"Why indeed not?" said the other with a sudden recrudescence of his usual gaiety. "I can do it, old compeer! Dondersteen, but I should be a smeerlap if I did not. Wait one moment.... Let me just think.... Yes! I have the way clear in my mind now.... I will be here as early as I was to-day." "By half-past seven o'clock the light is tolerable," said the artist. "By half-past seven then I shall have donned the doublet, and will not move off that platform unless you bid me, until the shadows have gathered in, in the wake of the setting sun. After that," he added with his accustomed merry laugh, "let Mynheer, the Burgomaster come, your picture shall not hang fire because of me." "That's brave!" said Frans Hals more cheerily. "If you will come I can do it. You will see how advanced that sleeve and collar will be by half-past seven to-morrow." His voice had quite a ring in it now; he fussed about in his studio, re-arranged the picture on the easel, and put aside the portrait of Jongejuffrouw Beresteyn; Diogenes watched him with amusement, but the frown had not quite disappeared from his brow. He had made two promises to-day, both of which he would have to fulfil at all costs. Just now, it was in a flash, that the thought came to him how he could help his friend and yet keep his word to Beresteyn. A quick plan had formed itself in his mind for accomplishing this--he saw in a mental vision the forced run on the ice back to Haarlem and back again in the wake of the sleigh. It could be done with much pluck and endurance and a small modicum of good luck, and already his mind was made up to it, whatever the cost in fatigue or privations might be. But time was pressing now. After a renewed and most solemn promise he took leave of Frans Hals, who already was too deeply absorbed in work to take much notice of his friend. The glorious, self-centred selfishness of genius was in him. He cared absolutely nothing for any worry or trouble he might cause to the other man by his demand for that sitting on the morrow. The picture mattered--nothing else--and the artist never even asked his friend if he would suffer inconvenience or worse by sacrificing his day to it to-morrow. CHAPTER XIII THE SPANISH WENCH An hour later in the tap-room of the "Lame Cow" Diogenes had finished explaining to his brother philosophers the work which he had in hand and for which he required their help. The explanation had begun with the words filled with portentous charm: "There will be 500 guilders for each of you at the end of our journey." And they knew from many and varied experiences of adventures undertaken in amicable trilogy that Diogenes would be as good as these words.