Sali became thoughtful.
"How old are you, Vreni?" he asked. "I should think you must be about seventeen?"
"I am seventeen and a half," answered she. "And you?"
"Guess!"
"Oh, I know, you are going on twenty."
"How do you know?" he asked.
"I won't tell you," she laughed.
"Won't tell me?"
"No, no," and she giggled merrily.
"But I want to know."