Omobono rapped on the tarred wood with the iron-shod end of his stick and listened. He could hear a number of girls' voices chattering, and one was singing softly in a language he did not understand. He knocked again, a moment later the voices were suddenly silent, and he heard the clacking of heavy slippers on wet flags as some one came to open. 'Who knocks?' asked a deep and harsh female voice from within, in the Greek tongue but with a thick accent. 'A Venetian who has business with the worthy Karaboghazji,' answered Omobono in a conciliatory tone. 'Which Karaboghazji?' enquired the voice suspiciously. 'Rustan,' explained Omobono mildly. From his voice, the woman probably judged that if he had come with any nefarious purpose she was more than a match for him. The door opened after some rattling and creaking of locks, and Omobono started in spite of himself. She was indeed a match for him, or for any other man who was likely to knock at the door. It was no wonder that the Venetian secretary drew back and hesitated before he spoke again. The woman was a huge red-haired negress in yellow, fully six feet tall in her heelless slippers, and her black arms, bare above the elbow, were as sinewy and muscular as any fisherman's or porter's. Her thick lips were parted in a sort of savage grin that showed two rows of teeth as sharp and white as a shark's; her hair must have been just dyed that day, for it was as red as flame to the very roots, and it stood out almost straight from her shiny black forehead and temples; as she rather contemptuously scrutinised Omobono from head to foot the whites of her coal-black eyes gleamed in a way that was positively terrifying. She wore wide Greek trousers of blue cotton, gathered at the ankle, and a wadded coat of yellow, that hung down below her knees in loose folds, like a sort of skirt, but fitted tightly over her tremendous shoulders. This garment was closely girded round her ample waist by a red sash, in which she carried her armoury, consisting of a serviceable Arab knife with a bone hilt and brass sheath, and a small whip made of a broad flat thong of hippopotamus hide with a short oak stock. This terrific apparition stood in the little vestibule holding the door open and grinning at Omobono. She had closed another door behind her before opening the outer one, for the slave-dealer's establishment was evidently managed with a view to the safety of his merchandise. 'And what do you want of Rustan Karaboghazji at this time of the afternoon?' enquired the negress. 'Who are you?' 'I am only a clerk,' answered Omobono in a deprecating tone, and shrinking a little under his cloak, as the awful virago thrust her head forward. 'I am the clerk of Messer Carlo Zeno, a rich Venetian merchant, who sends a message by me to your master----' 'My master!' interrupted the black woman, with a scornful laugh. 'My master, indeed!' 'I--I supposed----' faltered Omobono apologetically.