“That last is a deceitful one,” said the skipper.

* * * * *

The blue cloud was growing larger.

“If the snow,” said the doctor, “is appalling when it slips down the mountain, think what it is when it falls from the Pole!”

His eye was glassy.  The cloud seemed to spread over his face and simultaneously over the horizon.  He continued, in musing tones,—­

“Every minute the fatal hour draws nearer.  The will of Heaven is about to be manifested.”

The skipper asked himself again this question,—­“Is he a madman?”

“Skipper,” began the doctor, without taking his eyes off the cloud, “have you often crossed the Channel?”

“This is the first time.”

The doctor, who was absorbed by the blue cloud, and who, as a sponge can take up but a definite quantity of water, had but a definite measure of anxiety, displayed no more emotion at this answer of the skipper than was expressed by a slight shrug of his shoulders.

“How is that?”

“Master Doctor, my usual cruise is to Ireland.  I sail from Fontarabia to Black Harbour or to the Achill Islands.  I go sometimes to Braich-y-Pwll, a point on the Welsh coast.  But I always steer outside the Scilly Islands.  I do not know this sea at all.”

“That’s serious.  Woe to him who is inexperienced on the ocean!  One ought to be familiar with the Channel—­the Channel is the Sphinx.  Look out for shoals.”

“We are in twenty-five fathoms here.”

“We ought to get into fifty-five fathoms to the west, and avoid even twenty fathoms to the east.”

“We’ll sound as we get on.”

“The Channel is not an ordinary sea.  The water rises fifty feet with the spring tides, and twenty-five with neap tides.  Here we are in slack water.  I thought you looked scared.”

“We’ll sound to-night.”

“To sound you must heave to, and that you cannot do.”

“Why not?”

“On account of the wind.”

“We’ll try.”

“The squall is close on us.”

“We’ll sound, Master Doctor.”

“You could not even bring to.”

“Trust in God.”

“Take care what you say.  Pronounce not lightly the awful name.”

“I will sound, I tell you.”

“Be sensible; you will have a gale of wind presently.”

“I say that I will try for soundings.”

“The resistance of the water will prevent the lead from sinking, and the line will break.  Ah! so this is your first time in these waters?”

“The first time.”

“Very well; in that case listen, skipper.”

The tone of the word “listen” was so commanding that the skipper made an obeisance.

“Master Doctor, I am all attention.”

“Port your helm, and haul up on the starboard tack.”

“What do you mean?”

“Steer your course to the west.”