Christy gave him the order to cast loose the launch, and have it in readiness to lower into the water at a moment's notice; and Mr. Walbrook proceeded to obey it without delay. The first lieutenant then called Mr. Walters, a midshipman, and directed him to give his compliments to Mr. Vapoor, and ask him if he could spare the third assistant engineer for special duty for a couple of hours, more or less.