up and down. The woman opened the door of the little room, and took
a glove from a cupboard. Muller put it in his pocket and told the
woman not to leave the house for anything, as she might be sent for
to come to the police station at any moment. Then he went out into
the street with Amster. When they were outside in the sunlight, he
looked at the glove. It was a remarkably small size, made for a
man with a slender, delicate hand, not at all in accordance with the
large stout body of the man described by the landlady. Muller put
his hand into the glove and found something pushed up into the
middle finger. He took it out and found that it was a crumpled
tramway ticket.

"Look out for a shabby old closed coupe, with a driver about forty
years old who looks like a drunkard and wears a light overcoat. If
you find such a cab, engage it and drive in it to the nearest police
station. Tell them there to hold the man until further notice. If
the cab is not free, at least take his number. And one thing more,
but you will know that yourself, - the cab we are looking for will
have new glass in the right-hand window." Thus Muller spoke to his
companion as he put the glove into his pocket and unfolded the
tramway ticket. Amster understood that they had found the starting
point of the drive of the night before.

"I will go to all coupe stands," he said eagerly.

"Yes, but we may be able to find it quicker than that." Muller took
the little notebook, which he was now carrying in his pocket, and
took from it the tramway ticket which was in the cover. He compared
it with the one he had just found. They were both marked for the
same hour of the day and for the same ride.