CHAPTER XXVIII.
ONWARD TOWARD THE FORBIDDEN CITY The Master rang for full engine-power, and threw in all six helicopters with one swift gesture.
"Major," commanded he, as _Nissr's_ burned and wounded body began to quiver through all its mutilated fabric; "Major, man the machine-guns again.

All stations! _Quick_!" Bohannan departed.

The droning of the helicopters rose to a shrill hum.

The Master switched in the air-pressure system; and far underneath, white fountains of spumy water leaped up about the floats, mingled with sand and mud all churned to frenzy under the bursting energy of the compressed air released through thousands of tubules.
_Nissr_ trembled, hesitated, lifted a few inches, settled back once more.
Again the buzzer sounded.

The noise of rapid feet became audible above, in the upper galleries.