He made sure that the tank would not hold another pint of gas, and he was careful not to forget the canteens.
Then, when he had taken every precaution possible for their welfare, he climbed into his place and told Bland to start the motor.

He was taking precautions with Bland, also.
"We fly south," he yelled, when Bland climbed into the front seat.

"Make it southeast for ten miles or so--and then swing south.

I'll tap you on the shoulder when I want you to turn.

Whichever shoulder I tap, turn that way.