"On your word of honour?"
"On my word of honour."
"You saw nobody near the laboratory when you were there?"
"No, Miss St. Leger," Kitty replied, and a kind of sigh rustled round the listening ranks. The Principal turned to Duane.
"The key did not pass out of your charge except when Kitty had it?"
"No, Miss St. Leger."
"Where were you after dinner when the rest of the girls had gone to afternoon lessons?"
"In my study, resting. I stayed until it was time to return to the laboratory."
"And during that time you did not go to the laboratory yourself?"
"No, Miss St. Leger."