One more question was put to him by John, who asked, "Do these canals constitute your whole supply of water for drinking, as well as for all other purposes?"
"Oh no, John!" exclaimed Merna. "We draw all our pure water from deep wells. The soil of Mars, being much more lightly compacted than that of the earth, has absorbed an immense proportion of the water which was formerly upon its surface. Instead of having lost it by evaporation and radiation into space, we still have it below the surface, stored up ready for use in our time of need.
"For this reason, and also in consequence of the small amount of our planet's internal heat, the water has not undergone chemical change, and mostly lies at great depths; but, of course, well-boring is much easier work than on your world, and I expect our methods are rather in advance of yours.
"Your scientists seem to have overlooked some of these points altogether. You need not pity us for lack of water, as I have heard you doing, for we have an ample supply for many centuries to come; especially as we can purify water which has been used for general purposes, and store it up for use, over and over again. Our canals are only drawn upon for purposes connected with irrigation, or when absolutely pure water is not needed."
"Well," M'Allister exclaimed, "it doesn't seem that the Martians are so badly off for water as some of our clever people imagine! Why, I've read that the need of water here must be so great that the people, driven to desperation, must be fighting each other to extermination in order to get it."
"That is an entirely erroneous idea, sir," replied Merna; "and you may be quite sure that such a state of affairs will never be witnessed upon this planet. We know the time must come when our water supply will cease to be, but your people are needlessly pessimistic, and imagine terrors where we see none.
"In actual time, the end of Mars is still far distant; but, as compared with that of your world, it is very near. It will be possible, later on, to forecast, by means of our records of the rate of decrease, the time when our water supply will come to an end; but even now it is well understood how the crisis will be met. As the final period draws nearer, families will become smaller and smaller, and in the last Martian century no children will be born; so the diminishing water supply will suffice for the needs of the dwindling population. Thus the race will gradually die out naturally, and become extinct long before the conditions of our world can make life a terror. There will, therefore, be no self-slaughter, nor murderous extermination, amongst ourselves—we shall simply die out naturally.
"The planet will roll on, devoid of all life, so the loss of water and air will then be of no consequence. It will be a dead world; until, perhaps æons hence, a collision with some other large body may transform both into a nebula; and thus once more start them on the way to develop into a world capable of sustaining life. Thus nothing in the Universe really dies; the apparent death is only the preparation for a newer and higher life.
"We Martians have no fear or dread of death, such as I have heard you say is so prevalent in your world even amongst religious people. With us death, in the ordinary way, is merely like going to sleep; and it is only the portal through which we pass to another life on another planet. Why, then, should we dread it? It is simply a removal to another dwelling-place!"
"I quite agree with that view, Merna," said John; "and our religion teaches us a somewhat similar idea; yet few of its professors look forward with anything but dread to the time when they must pass from their present life."