My friend rose lazily from his armchair and stood with his hands in the pockets of his dressing-gown, looking over my shoulder. It was a bright, crisp February morning, and the snow of the day before still lay deep upon the ground, shimmering brightly in the wintry sun.

Down the centre of Baker Street it had been ploughed into a brown crumbly band by the traffic, but at either side and on the heaped-up edges of the footpaths it still lay as white as when it fell.

The grey pavement had been cleaned and scraped, but was still dangerously slippery, so that there were fewer passengers than usual. Indeed, from the direction of the Metropolitan Station no one was coming save the single gentleman whose eccentric conduct had drawn my attention.

He was a man of about fifty, tall, portly, and imposing, with a massive, strongly marked face and a commanding figure. He was dressed in a sombre yet rich style, in black frock-coat, shining hat, neat brown gaiters, and well-cut pearl-grey trousers.

Yet his actions were in absurd contrast to the dignity of his dress and features, for he was running hard, with occasional little springs, such as a weary man gives who is little accustomed to set any tax upon his legs.

As he ran he jerked his hands up and down, waggled his head, and writhed his face into the most extraordinary contortions.