midnight
`` Though I knew it was of no use I called in Dr. Howe , who lives up the street from the laboratory . I should have called Dr. Harris , who used to be my own physician , but since his return from Africa with the Borland expedition , he has not been in very good health and has practically given up his practice . Dr. Howe is the best practising physician in town , I think . '' `` We shall call on him to-morrow , '' said Craig , snapping his watch , which already marked far after midnight . Dr. Howe proved , the next day , to be an athletic-looking man , and I could not help noticing and admiring his powerful frame and his hearty handshake , as he greeted us when we dropped into his office with a card from Winslow . The doctor 's theory was that Cushing had committed suicide . `` But why should a young man who had invented a new method of polymerising isoprene , who was going to become wealthy , and was engaged to a beautiful young girl , commit suicide ? ''