A great deal depends on finding him at once.

Ever since May, endeavours have been made to track him, but without success." "Perhaps he is dead," said the professor.
"Perhaps so; but even then it is important to know.

Can you help me to find out his whereabouts ?" "Undoubtedly I can; but I must have a good photograph of him.

Have you one ?" "I have not." "Could you obtain one ?" "I think not." "But this man has been seen by many people.

Could not some one you know, and who knows him, sketch a faithful likeness from memory ?" "I do not know of any one." "Then I could not guarantee to find him.