The results of these discoveries will in due time appear, fully elaborated in learned and authoratative treatises prepared by these savants' themselves. I shall only call attention to one, which seemed to me very remarkable. I have already said that there were astonishing differences in the personal appearance of the Martians evidently arising from differences of character and education, which had impressed themselves in the physical aspect of the individuals. We now learned that these differences were more completely the result of education than we had at first supposed. Looking about among the Martians by whom we were surrounded, it soon became easy for us to tell who were the soldiers and who were the civilians, simply by the appearance of their bodies, and particularly of their heads. All members of the military class resembled, to a greater or less extent, the monarch himself, in that those parts of their skulls which our phrenologists had designated as the bumps of destructiveness, combativeness and so on were enormously and disproportionately developed. And all this, we were assured, was completely under the control of the Martians themselves. They had learned, or invented, methods by which the brain itself could be manipulated, so to speak, and any desired portions of it could be especially developed, while other parts of it were left to their normal growth. The consequence was that in the Martian schools and colleges there was no teaching in our sense of the word. It was all brain culture. A Martian youth selected to be a soldier had his fighting faculties especially developed, together with those parts of the brain which impart courage and steadiness of nerve. He who was intended for scientific investigation had his brain developed into a mathematical machine, or an instrument of observation. Poets and literary men had their heads bulging with the imaginative faculties. The heads of the inventors were developed into a still different shape. "And so," said Aina, translating for us the words of a professor in the Imperial University of Mars, from whom we derived the greater part of our information on this subject, "the Martian boys do not study a subject; they do not have to learn it, but, when their brains have been sufficiently developed in the proper direction, they comprehend it instantly, by a kind of divine instinct."