The machines had traveled some fifty miles on the north side of the Duna, when a shout from Marovitch, in the craft driven by Henri, caused the pilot to suddenly set the planes for descent.

On the glittering white surface of the steppe there appeared a new color effect—moving discs of scarlet!

CHAPTER VII.
BROTHERS OF THE BLOOD.

The Cossacks rode in a wide circle, ’round and ’round the settled aeroplanes, at which the wild ponies snorted and seemingly feared to approach.

When, however, Salisky and Marovitch each gave vent to one of those weird calls peculiar to the denizens of the desert, the tribesmen drove their shaggy mounts full speed toward the searching party.

Nikita was the first to dismount. He knew the scouts, and gave them guttural greeting. The question in his keen eyes, though, did not sound from the lips. He had caught a glimpse of the boys, still seated in the biplanes. The tall chief was instantly a-quiver with a certain fierce joy of possession—that which he desired had apparently been delivered into his hands.

“You bring these young dogs to me?”

“We bring to you, chief, brave lads who have risked much for your welfare—for your life, chief, for your very life!”

Salisky, who had no knowledge of that past, wherein had crossed the paths of Nikita and these boys, and sizing only the present purpose of his young friends, was inclined to indignantly resent the address of the Cossack.

“With my life what have they to do?”