On Mars there were fewer large bodies of water, and a very much greater proportion of land. In fact, about the Equator, whither we were steering, there seemed to be a broad, uninterrupted zone of land, with occasional bays or inlets cutting into it, but never crossing it. An open sea of considerable proportions surrounded the great ice-cap at each pole, and it was apparently thus possible to travel entirely around the globe, either by sea or by land, as one might choose.

"Behold again the infinite wisdom of the Creator!" cried the doctor. "Although Mars is a much smaller planet than our own, it is fitted for almost as large a population. The land is nearly all grouped about the Equator, where it is warm enough to live comfortably. On the contrary, on Earth there is no important civilization under the Equator, and most of the land is favourably located in the north temperate zone. On Earth the intervention of great oceans between the continents kept the population restricted to Asia and Egypt for centuries, and to the Old World for a still longer time. But here, this band of continuous land has made it easy and natural to explore the whole globe, and its inhabitants have had ample time and opportunity to distribute themselves."

But by far the most wonderful thing that we had been observing for a long time, and which became more remarkable as we approached, was that the entire planet, seas and continents alike, gave off a reddish light. This tinge of red had been visible ever since we had left the Earth. Much further back we had observed that it seemed to extend a little beyond the outline of Mars, and we now saw that even the white light from the snow-caps had a faint tinge of red.

"For centuries the ruddy light of this planet has been remarked," said the doctor. "His very name was given him because of his gory, warlike appearance. Scientists have attempted to explain it by supposing that his vegetation is uniformly red, instead of green like ours. Still others, objecting that his vegetation could not possibly be rank or plentiful, or continue the same colour through all seasons, have supposed that his soil or primæval rock is of a deep red colour. But neither of these suppositions explain why his seas should give off a reddish light mixed with their green, or why the pure white of polar snows should be tinged with crimson."

We must have been still two hundred miles above the surface when the barometer began to rise feebly, indicating that we were already entering the Martian atmosphere; and, as we proceeded, the reddish glow spread all around us, and was even dimly visible behind as well as in front. We were still travelling too rapidly to plunge into the denser atmosphere or attempt a landing. Besides, we wished to explore the planet, and find life and civilization before choosing a landing place. And as we drew nearer, in a constantly narrowing circle, that red haze was all about us everywhere.

"There can be but one explanation of it," said the doctor at last. "This red is a colour in the Martian atmosphere. It seems very strange and almost impossible to us; but we must prepare ourselves for extremely unusual and even apparently impossible things."

But this seemed to disturb the doctor greatly, as also did the fact that we could no longer breathe with comfort the rare air which we had not found objectionable far back in space. Our returning weight made physical effort again necessary, and we were able to exert ourselves but little without panting and gasping. The rarest air we had used had shown a pressure of fourteen, and we were now compelled to increase this to eighteen in order to be comfortable.

"This Martian air is sure to give us trouble," the doctor said to me after considerable reflection. "In the first place, its red colour makes me fear it is not composed of the same gases that our air is. If it should turn out to be a mixture of oxygen and nitrogen, like ours, there is the possibility that this red matter which gives it colour will be poisonous to us. And even if it is not harmful, I do not think the air will have a pressure above ten or eleven, and we seem to need eighteen or twenty for comfort. I shall be very sorry if we have to return at once; but our supply of air is limited, you know."

"You keep a close watch through your telescope for those flying men you promised to show me," I answered. "If they can live in this air, I think we can manage it somehow. I will not go back while there is a breath left in me."

But as we drew nearer and nearer to the surface we did not discover the slightest sign of habitation. As far as we could see there was a great desert, barren of all vegetation, and apparently unwatered since creation. Our telescope did not detect the existence even of animals or creeping things.