nd 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 eve