He drew back a step or so, and, putting his hands on his hips, began to sing, throwing his voice upward that it might pass through the broken window.  He had a splendid and vibrant young voice, though he knew nothing of its fine quality.  Just now he wanted only to make it loud.

In the street outside very few people were passing.  An irritable old gentleman who was taking an invalid walk quite jumped with annoyance when the song suddenly trumpeted forth.  Boys had no right to yell in that manner.  He hurried his step to get away from the sound.  Two or three other people glanced over their shoulders, but had not time to loiter.  A few others listened with pleasure as they drew near and passed on.

“There’s a boy with a fine voice,” said one.

“What’s he singing?” said his companion.  “It sounds foreign.”

“Don’t know,” was the reply as they went by.  But at last a young man who was a music-teacher, going to give a lesson, hesitated and looked about him.  The song was very loud and spirited just at this moment.  The music-teacher could not understand where it came from, and paused to find out.  The fact that he stopped attracted the attention of the next comer, who also paused.

“Who’s singing?” he asked.  “Where is he singing?”

“I can’t make out,” the music-teacher laughed.  “Sounds as if it came out of the ground.”

And, because it was queer that a song should seem to be coming out of the ground, a costermonger stopped, and then a little boy, and then a workingwoman, and then a lady.

There was quite a little group when another person turned the corner of the street.  He was a shabby boy on crutches, and he had a frantic look on his face.

And Marco actually heard, as he drew near to the group, the tap-tap-tap of crutches.

“It might be,” he thought.  “It might be!”

And he sang the trumpet-call of the chorus as if it were meant to reach the skies, and he sang it again and again.  And at the end of it shouted, “Hallo!  Hallo!  Hallo!  Hallo!  Hallo!”

[Illustration:  The Rat swung himself into the group.  “Where is he!” “Where is he!” he cried.]

The Rat swung himself into the group and looked as if he had gone crazy.  He hurled himself against the people.

“Where is he!  Where is he!” he cried, and he poured out some breathless words; it was almost as if he sobbed them out.

“We’ve been looking for him all night!” he shouted.  “Where is he!  Marco!  Marco!  No one else sings it but him.  Marco!  Marco!” And out of the area, as it seemed, came a shout of answer.

“Rat!  Rat!  I’m here in the cellar—­locked in.  I’m here!” and a big piece of coal came hurtling through the broken window and fell crashing on the area flags.  The Rat got down the steps into the area as if he had not been on crutches but on legs, and banged on the door, shouting back: 

“Marco!  Marco!  Here I am!  Who locked you in?  How can I get the door open?”