"'How long were you engaged upon your search for the man?'
"'I can't exactly fix it.'
"'May we say an hour?'
"'That would be near the length of time.'
"We will now deal with Constable Wigg. He was asked--
"'How did you summon Constable Nightingale to your assistance?'
"'I blew my police whistle.'
"'Many times?'
"'Not many. He must have been very near.'
"'But he did not make his appearance immediately?'