My blood boiled as I saw it and I think I should have sprung at him, had not Bickley caught hold of me, shouting, "Don't, or he will kill her and us too." Yva lifted her shield and returned to her station, and in the blue discharges which now flashed almost continuously, and the phosphorescent glare of the advancing mountain, I saw that though her beautiful face worked beneath the pain of the blow, her eyes remained serene and purposeful.

Even then I wondered--what was the purpose shining through them.

Also I wondered if I was about to be called upon to make that sacrifice of which she had spoken, and if so, how.

Of one thing I was determined--that if the call came it should not find me deaf.

Yet all the while I was horribly afraid.
At another sign from Oro, Yva did something more to the lens--again, being alongside of her, I could not see what it was.