That is the story as David Innes told it to me in the goat-skin tent upon the rim of the great Sahara Desert.  The next day he took me out to see the prospector—­it was precisely as he had described it.  So huge was it that it could have been brought to this inaccessible part of the world by no means of transportation that existed there—­it could only have come in the way that David Innes said it came—­up through the crust of the earth from the inner world of Pellucidar.

I spent a week with him, and then, abandoned my lion hunt, returned directly to the coast and hurried to London where I purchased a great quantity of stuff which he wished to take back to Pellucidar with him.  There were books, rifles, revolvers, ammunition, cameras, chemicals, telephones, telegraph instruments, wire, tool and more books—­books upon every subject under the sun.  He said he wanted a library with which they could reproduce the wonders of the twentieth century in the Stone Age and if quantity counts for anything I got it for him.

I took the things back to Algeria myself, and accompanied them to the end of the railroad; but from here I was recalled to America upon important business.  However, I was able to employ a very trustworthy man to take charge of the caravan—­the same guide, in fact, who had accompanied me on the previous trip into the Sahara—­and after writing a long letter to Innes in which I gave him my American address, I saw the expedition head south.

Among the other things which I sent to Innes was over five hundred miles of double, insulated wire of a very fine gauge.  I had it packed on a special reel at his suggestion, as it was his idea that he could fasten one end here before he left and by paying it out through the end of the prospector lay a telegraph line between the outer and inner worlds.  In my letter I told him to be sure to mark the terminus of the line very plainly with a high cairn, in case I was not able to reach him before he set out, so that I might easily find and communicate with him should he be so fortunate as to reach Pellucidar.

I received several letters from him after I returned to America—­in fact he took advantage of every northward-passing caravan to drop me word of some sort.  His last letter was written the day before he intended to depart.  Here it is.

     My Dear Friend: 

Tomorrow I shall set out in quest of Pellucidar and Dian.  That is if the Arabs don’t get me.  They have been very nasty of late.  I don’t know the cause, but on two occasions they have threatened my life.  One, more friendly than the rest, told me today that they intended attacking me tonight.  It would be unfortunate should anything of that sort happen now that I am so nearly ready to depart.

     However, maybe I will be as well off, for the nearer the hour
     approaches, the slenderer my chances for success appear.

     Here is the friendly Arab who is to take this letter north for me,
     so good-bye, and God bless you for your kindness to me.