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Rh and ceasing to be productive. Whatever does put a check upon population be sure that it will not be a painful thing: War, Famine, Pestilence and Co. are said to be the natural checks, but these cannot be. For long before the race can attain full growth Altruism must abolish war, cleanliness must make pestilence impossible, and as to famine—well, we have made provision already for several bad harvests of a world-wide extension. The check to the population of a planet is like the check to an individual. On Earth men grow and reach six feet in height, on Mars they reach but four feet, and yet one is not conscious of his bigness nor the other of his littleness, for each is adapted to his surroundings and circumstances, and what is true of the atom, is true of the whole.'

The doctor paused, and seemed for a moment afraid that her zeal had carried her too far. I set her mind at rest on that score by saying, 'Thank you, doctor, for your lucid reasoning of the question; your verbal answer to the croakers is surely superior to the practical one that you kindly placed to my credit. They have not a leg left to stand on. How I wish, that your argument could be conveyed to the Malthusians of earth, for there surely the idea of over-population is absurd.'

'What Dr. Somers says will be written on earth in a few hours' said Grayson. 'You will write it there. All you have to do is to see that your diary does not get lost like mine was.'

'Indeed,' said the doctor; 'Frankston is a diarist then?'

'He is, though strange to say he does not know it on this side of his being. If he should become conscious on both, sides he will convey a vast amount of information to both worlds. I hope to introduce him to the club of the earth born when we get to the metropolis.'

'I, too, shall be pleased to meet him; not at that club, for I have no right to enter that I know of, but in my own home.'

'Be sure that I shall make the most of your invitation,' I answered.

We separated, to spend the latter part of the afternoon each in our own way, Grayson remarking that we would remain the night here and spend the morning in visiting the sights he promised me. He made arrangements for our catching the boat at Port Howard at sixteen in the afternoon of next day.

I climbed Mount Weston on foot, and had a final view of the plain at sunset.

The next morning found Grayson and myself at an early hour flying rapidly towards a distant point on the plain. It was soon reached, and we entered a small building at the source of one of the rivers previously mentioned.

We went down a spiral staircase and entered a little room, one side of which had a wall moving in a circular movement in a close-fitting bed of what appeared to be bronze.