But it seems that Providence never intended that the world should be without calamities. If man prevented those of possible internal origin there still remained undreamed of external sources over which he had no control. It was one of these which was to prove our undoing. Its seed was sown thirty-three years before I was born, upon that historic day, June 10th, 1967, that Earth received her first message from Mars, since which the two planets have remained in constant friendly communication, carrying on a commerce of reciprocal enlightenment. In some branches of the arts and sciences the Martians, or Barsoomians, as they call themselves, were far in advance of us, while in others we had progressed more rapidly than they. Knowledge was thus freely exchanged to the advantage of both worlds. We learned of their history and customs and they of ours, though they had for ages already known much more of us than we of them. Martian news held always a prominent place in our daily papers from the first. They helped us most, perhaps, in the fields of medicine and aeronautics, giving us in one, the marvelous healing lotions of Barsoom and in the other, knowledge of the Eighth Ray, which is more generally known on Earth as the Barsoomian Ray, which is now stored in the buoyancy tanks of every air craft and has made obsolete those ancient types of plane that depended upon momentum to keep them afloat. That we ever were able to communicate intelligibly with them is due to the presence upon Mars of that deathless Virginian, John Carter, whose miraculous transportation to Mars occurred March 4th, 1866, as every school child of the twenty-first century knows. Had not the little band of Martian scientists, who sought so long to communicate with Earth, mistakenly formed themselves into a secret organization for political purposes, messages might have been exchanged between the two planets nearly half a century before they were, and it was not until they finally called upon John Carter that the present interplanetary code was evolved. Almost from the first the subject which engrossed us all the most was the possibility of an actual exchange of visits between Earth Men and Barsoomians. Each planet hoped to be the first to achieve this, yet neither withheld any information that would aid the other in the consummation of the great fact. It was a generous and friendly rivalry which about the time of my graduation from the Air School seemed, in theory at least, to be almost ripe for successful consummation by one or the other. We had the Eighth Ray, the motors, the oxygenating devices, the insulating processes—everything to insure the safe and certain transit of a specially designed air craft to Mars, were Mars the only other inhabitant of space. But it was not and it was the other planets and the Sun that we feared.