"Why don't you join them and teach them how to sing, if you know so much about it?" Tired Tim persisted.
"Oh, I've no time for that," Ferdinand Frog answered.
And then it was his companion's turn to snicker.
"You appear to have plenty of time to waste here," he observed. "It's my opinion that there's just one reason why you don't go to the Cedar Swamp singing parties."
"What's that?" Mr. Frog inquired with a slight trace of uneasiness.
"They haven't invited you."
"How did you guess that?" Ferdinand Frog asked him.
He wished, the next moment, that he had not put that question to Tired Tim. For he saw at once that he had given his sad secret away.