them to take it in hand again.

Some colour had now come back to his checks; for on returning to the
interests of his life of battle he felt his energy restored. He again
reverted to the question of the little motor, and spoke of it for some
time with Thomas, while Pierre waited, feeling quite upset. Ah! he
thought, how universal was the thirst for happiness! Then, in spite of
the many technical terms that were used he caught a little of what the
others were saying. Small steam motors had been made at the works in
former times; but they had not proved successes. In point of fact a new
propelling force was needed. Electricity, though everyone foresaw its
future triumph, was so far out of the question on account of the weight
of the apparatus which its employment necessitated. So only petroleum
remained, and the inconvenience attaching to its use was so great that
victory and fortune would certainly rest with the manufacturer who should
be able to replace it by some other hitherto unknown agent. In the
discovery and adaptation of the latter lay the whole problem.

"Yes, I am eager about it now," at last exclaimed Grandidier in an
animated way. "I allowed you to prosecute your experiments without
troubling you with any inquisitive questions. But a solution is becoming
imperative."

Thomas smiled: "Well, you must remain patient just a little longer," said
he; "I believe that I am on the right road."

Then Grandidier shook hands with him and Pierre, and went off to make his
usual round through his busy, bustling works, whilst near at hand,
awaiting his return, stood the closed pavilion, where every evening he
was fated to relapse into endless, incurable anguish.

The daylight was already waning when Pierre and Thomas, after
re-ascending the height of Montmartre, walked towards the large work-shop
which Jahan, the sculptor, had set up among the many sheds whose erection
had been necessitated by the building of the Sacred Heart. There was here
a stretch of ground littered with materials, an extraordinary chaos of
building stone, beams and machinery; and pending the time when an army of
navvies would come to set the whole place in order, one could see gaping
trenches, rough flights of descending steps and fences, imperfectly
closing doorways which conducted to the substructures of the basilica.

Halting in front of Jahan's work-shop, Thomas pointed to one of these
doorways by which one could reach the foundation works. "H