Whilst they were carefully regarding this--Adam with the aid of an opera-glass--their nostrils were assailed by a horrid stench, something like that which rose from the well-hole in Diana's Grove.
By degrees, as their eyes got the right focus, they saw an immense towering mass that seemed snowy white.

It was tall and thin.

The lower part was hidden by the trees which lay between, but they could follow the tall white shaft and the duplicate green lights which topped it.

As they looked there was a movement--the shaft seemed to bend, and the line of green light descended amongst the trees.

They could see the green light twinkle as it passed between the obstructing branches.
Seeing where the head of the monster was, the two men ventured a little further forward, and saw that the hidden mass at the base of the shaft was composed of vast coils of the great serpent's body, forming a base from which the upright mass rose.