He turned again to the spoor of the stranger bull,which showed plainly to his trained senses, nor did heglance back to note if Taug followed. The latter laidGazan in Mumga's arms with a parting: "If he dies Tarzanwill kill you," and he followed after the brown-skinnedfigure that already was moving at a slow trot alongthe jungle trail.

No other bull of the tribe of Kerchak was so good atrailer as Tarzan, for his trained senses were aidedby a high order of intelligence. His judgment told himthe natural trail for a quarry to follow, so that heneed but note the most apparent marks upon the way,and today the trail of Toog was as plain to him as typeupon a printed page to you or me.

Following close behind the lithe figure of the ape-man camethe huge and shaggy bull ape. No words passed between them. They moved as silently as two shadows among the myriadshadows of the forest. Alert as his eyes and ears,was Tarzan's patrician nose. The spoor was fresh, and nowthat they had passed from the range of the strong ape odorof the tribe he had little difficulty in following Toogand Teeka by scent alone. Teeka's familiar scent spoortold both Tarzan and Taug that they were upon her trail,and soon the scent of Toog became as familiar as the other.

They were progressing rapidly when suddenly denseclouds overcast the sun. Tarzan accelerated his pace. Now he fairly flew along the jungle trail, or, where Tooghad taken to the trees, followed nimbly as a squirrel alongthe bending, undulating pathway of the foliage branches,swinging from tree to tree as Toog had swung before them;but more rapidly because they were not handicapped by aburden such as Toog's.

Tarzan felt that they must be almost upon the quarry,for the scent spoor was becoming stronger and stronger,when the jungle was suddenly shot by livid lightning,and a deafening roar of thunder reverberated through theheavens and the forest until the earth trembled and shook. Then came the rain--not as it comes to us of thetemperate zones, but as a mighty avalanche of water--adeluge which spills tons instead of drops upon the bendingforest giants and the terrified creatures which haunttheir shade.