It was not condensed enough to be visible to direct vision, yet he was aware of it from the corner of his eye.
Shapeless and threatening, the gloomy thickness of the air floated beside him like the vague monster of a dream.

Sometimes he fancied that he saw an arm or a limb among the folds of the cloud, or an approach to a face; the instant he looked it vanished.

Marching at each hand these vapours bore him horrible company.
His brain became unsteady, and flickering things moved about him; yet, though alarmed, he was not afraid; his senses were not acute enough for fear.

The heat increased; his hands were intolerably hot as if he had been in a fever, he panted; but did not perspire.

A dry heat like an oven burned his blood in his veins.