As for me, I hoisted sail with something so near a chuckle that it surprised me; and I looked at Evelyn Grey to see whether she had noticed the unseemly symptom.

Apparently she had not. She sat forward, her eyes fixed soulfully upon the moon. Had I been dedicated to any profession except a scientific one—but let that pass.

Grue in Kemper's sail-boat led, and my boat followed out into the silvery and purple dusk, now all sparkling under the high lustre of the moon.

Dimly I saw vast rafts of wild duck part and swim leisurely away to port and starboard, leaving a glittering lane of water for us to sail through; into the scintillant night from the sea sprang mullet, silvery, quivering, falling back into the wash with a splash.

Here and there in the moonlight steered ominous black triangles, circling us, leading us, sheering across bow and flashing wake, all phosphorescent with lambent sea-fire—the fins of great sharks.

"You need have no fear," said I to the pretty waitress.

She said nothing.

"Of course if you are afraid," I added, "perhaps you might care to change your seat."

There was room in the stern where I sat.

"Do you think there is any danger?" she asked.