What does Farmer Browne mean when he says, "I reckon it's not always like that fine scientist B. Franklin once said, "...the
rotten apple spoils his companion?'

A person who is injured often wants to injure another in return

Explanation:

When Farmer Browne said, "I reckon it's not always like that fine scientist B. Franklin once said, "...the rotten apple spoils his companion?", he meant "a person who is injured often wants to injure another in return".

This means that someone can decide to injure other people in any way possible just because they were also injured.

A bad apple among other good apples will definitely cause harm (rottenness) to other good ones. This harm can be an injury or a bad influence.

butt

explanation:

a. inform

explanation:

"how to" tells us that it will explain how to, which means to inform