In To Kill a Mockingbird, was Boo Radley mad when his brother put cement into the tree? And why did his brother do it in the first place anyway?  

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As the previous post explained, Boo Radley's brother did not put cement into the tree. Boo Radley's father, Nathan Radley, filled the hole in the tree with cement. In chapter seven, Jem asks Nathan the reason for filling the tree knot with cement.

“Mr. Radley, ah—did you put cement in that hole in that tree down yonder?”

“Yes,” he said. “I filled it up.”

“Why’d you do it, sir?”

“Tree’s dying. You plug ‘em with cement when they’re sick. You ought to know that, Jem.”

Jem asks Atticus about the tree's health, and Atticus believes that the tree is quite healthy. Jem, Scout, and readers are left to believe that Nathan Radley is lying, and that he put cement in the tree to stop his son from leaving gifts for Scout and Jem.

Readers are never told how Boo feels about the knothole being plugged up with cement by his father. Part of the reason is that the story is being narrated by Scout. We know her thoughts throughout the story, but we only know the thoughts of other characters if they speak about them. Boo has very minimal spoken interaction with Scout, and the tree is not a topic that Boo and Scout talk about near the end of the story.

Readers can probably be quite sure that Boo Radley isn't happy about having cement put into the knot of the tree. That knot allowed him to "communicate" with Scout and Jem. Nathan Radley took that away from Boo. It's possible that Boo was angry about his father's actions; however, it's equally likely that Boo was sad or frustrated instead.

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First, I want to be clear that it was Nathan Radley, Boo's father, who put cement in the knot of the tree outside of the Radley home.  Although he claimed to Jem and Scout that this was because the tree was dying, Atticus confirmed that the tree was very much alive.  In reality, the reader is led to believe that Nathan cemented the tree because Boo was placing gifts for Jem and Scout (carved figures, pocket watch, etc.) in the tree knot and that Nathan wanted to discourage such interaction.

As we do not see or hear from Boo until chapters later, we have no definitive way of knowing Boo's reaction.  One has to assume, however, that Boo was frustrated and upset by the action, as it cut off his way of "communicating" with Jem and Scout and his connection to the outside world.

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