When he reached the street which had swallowed her he could see nothing of the form which had excited him.

Then, far ahead, he again saw it passing under a distant lamp-post and merge once more into the darkness.

He ran quickly in pursuit.
The girl heard him coming and looked back anxiously.

This time he saw her face.

In a bound he was at her side.
"Sisily, Sisily!" he cried.