Suddenly a peculiar thrill shook the car.  With a bounding heart I started to my feet and dashed into the engine-room.  It was true then.  Yes, it was true. The engines were at work, and we were saved!

CHAPTER XIII.

HOME AGAIN.

We owed our salvation to Mr. Carmichael.  The firing of our magazine rifles, followed by the news of our perilous situation, had roused him from his lethargy.  Although still unable to speak, he had contrived by means of his eyes to make his daughter understand that he wished another dose of oxygen.  When she was about to administer it, he called her attention to the fact that in expanding as it issued from the cylinder, the gas became very cold.  She caught his meaning instantly, and on applying the gas to the sensitive parts of the machinery had succeeded in cooling and releasing them.

It seems that Carmichael, in order to save time, had been working the engines at an unusually high speed, which, together with the heat of the sun, had caused them to jam.  Their enforced rest had of itself allowed them to cool somewhat, and by reducing the speed until we reached a cooler region, they did not stick again.

Carmichael recovered from his illness, and the journey to the earth was accomplished without accident.  We landed safely on some undiscovered islands in the Arctic Circle, and after a flying visit to the North Pole in the vicinity, we bore away for England, keeping as high over the sea as possible to escape notice.  Going southward we passed through all sorts of weather, thick snow, hurricanes of wind and rain, dry or wet fogs, and so forth; but it made no difference to us.  Crossing Spitzbergen, the car was frosted over with ice needles, which, however, were soon thawed by a warmer current of air.  Between Iceland and the coast of Norway we glided through a magnificent aurora borealis that covered the whole sky with a luminous curtain, and made us fancy we had floated unawares into the fabulous Niffleheim of the old Scandinavian gods.  Near the Faroe Islands we dashed into a violent thunderstorm, and were almost deafened by the terrific explosions, or blinded by the flashes of lightning.  Otherwise we could enjoy both of these electrical displays without fear, as the metallic shell of the car was a good protective screen.  Certainly our flying machine would be an excellent means of making observations in meteorology, from the sampling of cirrus cloud to the chasing of a tornado.

The first sign of man we saw was a ship rolling in a storm off the Hebrides; but apparently she was not in distress, else we should have gone to her succour.  How easy with such a car to rescue lives and property from sinking ships, and even patrol the seas in search of them!