unknown to you, this envelope." The Doctor held it up.
"He made me swear I would keep its existence secret from every living being, until the date marked upon it, at which time, in the event of his not having returned, it was to be opened. Look at it." The Doctor laid the envelope on the table.
"It is inscribed, as you see, 'To be opened by Dr. Frank Adams at 8 P. M. on September 4th, 1923.' For five years, gentlemen, I kept that envelope, knowing nothing of its contents and waiting for the moment when I might, with honor, open it. The struggle has been a hard one. Many times I have almost been able to persuade myself, in justice to our friend's safety—his very life, probably—that it would be best to disregard his instructions. But I did not; I waited until the date set and then, a little more than a month ago, alone in my office, I opened the envelope."
The Doctor leaned forward in his chair and shuffled the papers he held in his hand. His three friends sat tense, waiting.
"The envelope contained these papers. Among them is a letter in which I am directed to explain everything to you as soon as I succeed in doing certain other things. Those things I have now accomplished. So I have sent for you. I'll read you the letter first."
No one spoke when the Doctor paused. The Banker drew a long breath. Then he bit the end off a fresh cigar and lit it with a shaking hand. The Doctor shifted his chair closer to the table under the light.
"The letter is dated September 14th, 1918. It begins: 'This will be read at 8 P. M. on September 4th, 1923, by Dr. Frank Adams with no one else present. If the envelope has been opened by him previous to that date I request him to read no further. If it has fallen into other hands than his I can only hope that the reader will immediately destroy it unread.'" The Doctor paused an instant, then went on.
"Gentlemen, we are approaching the most important events of our lives. An extraordinary duty—a tremendous responsibility, rests with us, of all the millions of people on this earth. I ask that you listen most carefully."
His admonition was quite unnecessary, for no one could have been more intent than the three men silently facing him.
The Doctor continued reading: "'From Dr. Frank Adams, I exact the following oath, before he reads further. You, Dr. Adams, will divulge to no one, for a period of thirty days, the formulas set down in these papers; you will follow implicitly the directions given you; you will do nothing that is not expressly stated here. Should you be unable to carry out these directions, you will destroy this letter and the formulas, and tell no one of their ever having been in existence. I must have your oath, Dr. Adams, before you proceed further.'"
The Doctor's voice died away, and he laid the papers on the table.
"Gentlemen," he went on, "later on in the letter I am directed to consult with you three, setting before you this whole matter. But before I do so I must exact a similar oath from each of you. I must have your word of honor, gentlemen, that you will not attempt to transgress the instructions given us, and that you will never, by word or action, allow a suggestion of what passes between us here in this room to-night, to reach any other person. Have I your promise?"
Each of his three hearers found voice to agree. The Banker's face was very red, and he mopped his forehead nervously with his handkerchief.
The Doctor picked up the papers. "The letter goes on: 'I am about to venture back into the unknown world of the ring. What will befall me there I cannot foretell. If by September 4th, 1923, I have not returned, or no other mortal has come out of the ring, it is my desire that you and the three gentlemen with you at the time of my departure, use this discovery of mine for the benefit of humanity in your world, or the world in the ring, exactly as I myself would have used it were I there.
"'Should the European war be in progress at that time, I direct that you four throw your power on the side of the United States for the defeat of the Central Powers. That you will be able to accomplish that defeat I cannot doubt.
"'If, on September 4th, 1923, the United States is formally at peace with the powers of the world, you are forbidden to use these chemicals for any purpose other than joining me in the world of the ring. If any among you wish to make the venture, which I hope may be the case, I request that you do so.
"'Among these pages you will find a list of fourteen chemicals to be used by Dr. Frank Adams during the month following September 4, 1923, for the compounding of my powders. Seven of these chemicals (marked A), are employed in the drug used to diminish bodily size. Those seven marked B are for the drug of opposite action.
"'You will find here a separate description of each chemical. Nine are well known and fairly common. Dr. Adams will be able to purchase each of them separately without difficulty. Three others will have to be especially compounded and I have so stated in the directions for each of them. Dr. Adams can have them prepared by any large chemical manufacturer; I suggest that he have not more than one of them compounded by the same company.
"'The two remaining chemicals must be prepared by Dr. Adams personally. Their preparation, while intricate, demands no complicated or extensive apparatus. I have tried to explain thoroughly the making of these two chemicals, and I believe no insurmountable obstacle will be met in completing them.
"'When Dr. Adams has the specified quantities of each of these fourteen chemicals in his possession, he will proceed according to my further directions to compound the two drugs. If he is successful in making these drugs, I direct that he make known to the three other men referred to, the contents of this letter, after first exacting an oath from each that its provisions will be carried out.
"'I think it probable that Dr. Adams will succeed in compounding these two drugs. It also seems probable that at that time the United States no longer will be at war. I make the additional assumption that one or more of you gentlemen will desire to join me in the ring. Therefore, you will find herewith memoranda of my first journey into the ring which I have already described to you; I give also the quantities of each drug to be taken at various stages of the trip. These notes will refresh your memory and will assist you in your journey.
"'I intend to suggest to Dr. Adams to-day when I hand him this letter, that in the event of my failure to return within a week, he make some adequate provision for guarding the ring in safety. And I must caution you now, before starting to join me, if you conclude to do so, that you continue this provision, so as to make possible your safe return to your own world.
"'If our country is at war at the time you read this, your duty is plain. I have no fears regarding your course of action. But if not, I do not care to influence unduly your decision about venturing into this unknown other world. The danger into which I personally may have fallen must count for little with you, in a decision to hazard your own lives. I may point out, however, that such a journey successfully accomplished cannot fail but be the greatest contribution to science that has ever been made. Nor can I doubt but that your coming may prove of tremendous benefit to the humanity of this other equally important, though, in our eyes, infinitesimal world.
"'I therefore suggest, gentlemen, that you start your journey into the ring at 8 P. M. on the evening of November 4, 1923. You will do your best to find your way direct to the city of Arite, where, if I am alive, I will be awaiting you.'"
CHAPTER X.
TESTING THE DRUGS
The Doctor laid his papers on the table and looked up into the white faces of the three men facing him. "That's all, gentlemen," he said.
For a moment no one spoke, and on the face of each was plainly written the evidence of an emotion too deep for words. The Doctor sorted out the papers in silence, glanced over them for a moment, and then reached for a large metal ash tray that stood near him on the table. Taking a match from his pocket he calmly lighted a corner of the papers and dropped them burning into the metal bowl. His friends watched him in awed silence; only the Very Young Man found words to protest.
"Say now, wait," he began, "why——"
The