Doc Commanding Voice

It was imperative to get to the office before the departure of the prowler who had lighted the match. Doc plunged into the taxi he had left standing in front, rapped an order.

Doc's voice had a magical quality of compelling sudden obedience to an order. With a squawl of clashing gears and a whine of spinning tires, the taxi doubled around in the street. It covered the several blocks in a fraction of a minute.

- The Man of Bronze (1933) Chapter 4