What does Billy infer about the stationmaster?

Billy infers that the stationmaster is a kind man based upon his actions.

Before going around to the front, I peeked in a window. The Stationmaster was in his office looking at some papers. He was wearing a funny little cap that had no top in it. He looked friendly enough but I still couldn’t muster up enough courage to go in.

I cocked my ear to see if I could hear puppies crying, but could hear nothing. A bird started chirping. It was a yellow canary in a cage. The stationmaster walked over and gave it some water. I thought, “Anyone that is kind to birds surely wouldn’t be mean to a boy.”