Mr. Keating sits next to Mr. McAllister at dinner, and Mr. McAllister lectures Mr. Keating about his choice to encourage the students to be creative and pursue their dreams.
Meanwhile, at their table, the group of guys examine an old yearbook. They've found Mr. Keating's page and see that he was involved in something called "The Dead Poets Society."
They question him about it in the schoolyard after dinner.
It's a secret, Mr. Keating says, and he goes on to explain what the meetings involved. They would "suck the marrow out of life" like Thoreau commanded. They'd gather in a cave and read poetry aloud, letting poetry "work its magic."
The bell rings, and Neil proposes to the guys that they reinstate the Dead Poets Society that night.
As they prepare for the night, Neil finds a book titled Five Centuries of Verse.
Inside, there's an inscription from Mr. Keating that's meant to be read at the opening of every DPS meeting.