He was always keyed up, alert
for attack, wary of being attacked, with an eye for sudden and unexpected missiles, prepared to act precipitately and coolly, to leap in with a flash of teeth, or to leap away with a menacing snarl.
The boy followed close upon his heels, his every sense upon the alert, his nerves keyed to the highest pitch of excitement.
He was, upon the instant, another creature--wary, alert, ready.
Again and again this phrase beat monotonously upon his brain--a dull, throbbing pain, yet mechanically his feet followed the trail of her slayer while, subconsciously, his every sense was upon the alert for the ever-present perils of the jungle.
In the depth of the jungle the cloud shadows produced a thick blackness that might almost be felt--a blackness that to you and me might have proven terrifying with its accompaniment of rustling leaves and cracking twigs, and its even more suggestive intervals of utter silence in which the crudest of imaginations might have conjured crouching beasts of prey tensed for the fatal charge; but through it Tarzan passed unconcerned, yet always alert.
She did not realize how far she and Gazan had become separated from the balance of the tribe, nor were her defensive senses upon the alert as they should have been.
Alert as his eyes and ears, was Tarzan's patrician nose.
In an instant I was on the alert
, for there could be no wood within that buried river that had not been man brought.
Most men have learned to read to serve a paltry convenience, as they have learned to cipher in order to keep accounts and not be cheated in trade; but of reading as a noble intellectual exercise they know little or nothing; yet this only is reading, in a high sense, not that which lulls us as a luxury and suffers the nobler faculties to sleep the while, but what we have to stand on tip-toe to read and devote our most alert
and wakeful hours to.
They were alert
and active, anxious that the work should go well, and fiercely irritable with whatever, by delay or confusion, retarded that work.
By the time this cautious search is over, a stout iron-bound bucket, precisely like a well-bucket, has been attached to one end of the whip; while the other end, being stretched across the deck, is there held by two or three alert
The combatants were watching each other with alert
eyes; a perfect stillness, a breathless interest reigned.