This precaution, dictated by the double motive of keeping together in the darkness, and also to avoid any one of the party accidentally falling into the pit—being observed, the Kafir led the way some little distance within the shaft.

“Heavens!” whispered Hoste. “What about the snakes? Supposing we tread on one?”

In the excitement of the moment this consideration had been quite overlooked. Now it struck dismay into the minds of the three white men. To walk along in pitch darkness in a narrow tunnel which you know to be infested with deadly serpents, with more than an even chance of treading upon one of the noisome reptiles at every step, is a position which assuredly needs a powerful deal of excitement to carry it through.

Au! Flash one beam of light in front, Ixeshane,” whispered the guide. “Not behind—for your life, not behind!”

Eustace complied, carefully shading the sides of the light with the flaps of his coat. It revealed that the cave here widened slightly, but made a curve. It further revealed no sign of the most dreaded enemy of the human race.

Here, then, it was decided to lie in wait. The lights carried by those approaching would hardly reach them here, and they could lurk almost concealed, sheltered by the formation of the tunnel.

The flash from Eustace’s lantern had been but momentary. And now, as they crouched in the inky gloom, the sense of expectation became painful in its intensity. Nearer and nearer floated the wailing chant, and soon the lurking listeners were able to recognise it as identical with the wild, heathenish rune intoned by their guide—the weird, mysterious invocation of the Serpent.

“Harm us not,
O Snake of snakes!
Do us no hurt
O Inyeka ’Nkúlu!”

The sonorous, open vowels rolled forth in long-drawn cadence, chanted by two voices—both blending in wonderful harmony. Then a cloud of nebulous light filled up the entrance to their present hiding place, hovering above the fearful hell-pit where the maniac was imprisoned, throwing the brink into distinct relief.

The watchers held their very breath. The song had ceased. Suddenly there was a flash of light in their eyes, as from a lantern.