When he came to a stop also it was near the trunk of a large tree, no more than a yard distant.
"The Professor is cunning," reflected Jared Long, watching every movement; "he'll whisk behind the tree the instant one of them makes a move.

Helloa! what's up now ?" To the astonishment of both white men the native with the bow shifted it at this moment to his right hand, holding the arrow in place against the string with the same hand, while the weapon was at his side.

Then he moved a step or two, as if to meet the stranger.
"Look out!" called the vigilant New Englander, "that chap is up to some deviltry." He did not refer to him with the bow and arrow, but to one of the others, who stealthily turned aside and vanished among the trees.
Being in the Professor's line of vision the latter observed the suspicious movement, and it cannot be said that it added to his comfort.
Meanwhile the archer advanced, but with such tardy step that it was evident he was timing his pace to that of his comrade who had so stealthily entered the wood.

Convinced that his real peril lay among those trees, Grimcke began a backward movement with such caution that he hoped it would not be noticed by the native who was approaching with a sluggish pace.
The forest, like all those in South America, was so dense that great care was necessary for one to pick his way through it.

The Professor's theory was that the savage with the spear would regulate his movements on the theory that the white man would not stir from the place where he had first halted.