August 10.—­At ten o’clock last night, as I anticipated, the tug went under and out, just in time to meet the Ebba and tow her through the channel to her creek, after which she returned with Ker Karraje and the others.

When I look out this morning, I see Thomas Roch and Engineer Serko walking down to the lagoon, and talking.  What they are talking about I can easily guess.  I go forward and take a good look at my ex-patient.  He is asking questions of Engineer Serko With great animation.  His eyes gleam, his face is flushed, and he is all eagerness to reach the jetty.  Engineer Serko can hardly keep up with him.

The crew of the tug are unloading her, and they have just brought ashore ten medium-sized boxes.  These boxes bear a peculiar red mark, which Thomas Roch examines closely.

Engineer Serko orders the men to transport them to the storehouses on the left bank, and the boxes are forthwith loaded on a boat and rowed over.

In my opinion, these boxes contain the substances by the combination or mixture of which, the fulgurator and deflagrator are to be made.  The engines, doubtless, are being made in an American foundry, and when they are ready, the schooner will fetch them and bring them to Back Cup.

For once in a while, anyhow, the Ebba has not returned with any stolen merchandise.  She went out and has returned with a clear bill.  But with what terrible power Ker Karraje will be armed for both offensive and defensive operations at sea!  If Thomas Roch is to be credited, this fulgurator could shatter the terrestrial spheroid at one blow.  And who knows but what one day, he will try the experiment?

CHAPTER XII.

ENGINEER SERKO’S ADVICE.

Thomas Roch has started work and spends hours and hours in a wooden shed on the left bank of the lagoon that has been set apart as his laboratory and workshop.  No one enters it except himself.  Does he insist upon preparing the explosive in secret and does he intend to keep the formula thereof to himself?  I should not wonder.

The manner of employing Roch’s fulgurator is, I believe, very simple indeed.  The projectile in which it is used requires neither gun nor mortar to launch it, nor pneumatic tube like the Zalinski shell.  It is autopropulsive, it projects itself, and no ship within a certain zone when the engine explodes could escape utter destruction.  With such a weapon as this at his command Ker Karraje would be invincible.

From August 11 to August 17.—­During the past week Thomas Roch has been working without intermission.  Every morning the inventor goes to his laboratory and does not issue therefrom till night.  I have made no attempt to stop him or speak to him, knowing that it would be useless to do so.

Although he is still indifferent to everything that does not touch upon his work he appears to be perfectly self-possessed.  Why should he not have recovered his reason?  Has he not obtained what he has so long sought for?  Is he not at last able to carry out the plans he formed years and years ago?