"Oh, don't!" begged Bess. "It reminds me of my school days. I never could tell the difference between latitude and longitude."

"Well, there's where Sea Horse Island is," went on Jack, "and if all had gone well, Mr. Robinson hoped to gather orchids there. Now—?" he hesitated.

"And do you think we'll touch near there, Jack?" asked his sister.

"I'm going to try."

"Oh, it is so good of you!" murmured Inez. "Perhaps we can save my father."

"At any rate, they ought to allow you to see him," put in Walter. "Political prisoners aren't supposed to be kept in solitary confinement. We'll have a try at him, anyhow; eh, Jack?"

"Sure. Well, that's our problem—to search among these islands, and
I think we have the very boat to do it."

Indeed the Tartar was just what they could have desired. It was a powerful motor boat, and had been in commission only a short time. It could weather a fairly big sea, or a heavy blow. It had a powerful motor, many comforts, and even some luxuries, including a bathroom.

The engine was located forward, where there was a sleeping room for the engineer, who could steer from a small pilot house. Or the craft could also be guided from the after deck, which was open.

There was a large enclosed space, variously divided into cabins and staterooms. A kitchen provided for ample meals, the cooking being done by the exhausted and heated gases from the motor, which also warmed the boat on the few days when the weather was rainy and chilly. When the motor was not running, a gasoline stove could be used.