18.  A Narrow Escape
The Auditorium Tower, where "the weather man" sits to flash his reports throughout the country, offered an inviting place for the boy to alight.  He dropped quietly upon the roof of the great building and walked down the staircase until he reached the elevators, by means of which he descended to the ground floor without exciting special attention.
The eager rush and hurry of the people crowding the sidewalks impressed Rob with the idea that they were all behind time and were trying hard to catch up.  He found it impossible to walk along comfortably without being elbowed and pushed from side to side; so a half hour's sight-seeing under such difficulties tired him greatly. It was a beautiful afternoon, and finding himself upon the Lake Front, Rob hunted up a vacant bench and sat down to rest.
Presently an elderly gentleman with a reserved and dignified appearance and dressed in black took a seat next to the boy and drew a magazine from his pocket.  Rob saw that he opened it to an article on "The Progress of Modern Science," in which he seemed greatly interested.
After a time the boy remembered that he was hungry, not having eaten a tablet in more than twenty-four hours.  So he took out the silver box and ate one of the small, round disks it contained.
"What are those?" inquired the old gentleman in a soft voice.  "You are too young to be taking patent medicines."