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Rh "Attention. Heed with care: this gentleman is my friend. He is detained merely as a matter of form. I do not wish him to be annoyed. Do you understand? You are to leave him to himself as long as he remains quietly below. But he is not to come on deck again till I return. Is all that clear, imbeciles?"

The imbeciles, saluting mechanically, indicated glimmerings of comprehension.

"Then below you go, Dr. Rodiek. And don't get impatient: I will rejoin you as soon as possible."

"Don't be long," Lanyard implored.

As he lowered himself through the hatch he saw the Prussian stumble down the gangplank and reel shoreward.

Well satisfied with his diplomacy, Lanyard lingered a while in the conning tower, closely studying and memorising the more salient features of the Island of Martha's Vineyard and its adjacent waters and mainland as delineated on a most comprehensive large-scale chart published by the German Admiralty from exhaustive soundings and surveys of its own navigators and typographers, with corrections of as recent date as the first part of the year 1917.

Here the breach in the south coast line which permitted the utilisation of what had formerly been an extensive fresh-water pond as this secret submarine base, was clearly shown. And a single glance confirmed the lieutenant's statement concerning its remote isolation from settled sections of the island.

Somewhat dismayed, Lanyard descended to the central operating compartment and scouted through the hold