It must in all truth be confessed, things as yet had gone on well, and I should have acted in bad taste to have complained. If the true medium of our difficulties did not increase, it was within the range of possibility that we might ultimately reach the end of our journey. Then what glory would be ours! I began in the newly aroused ardor of my soul to speak enthusiastically to the Professor. Well, was I serious? The whole state in which we existed was a mystery—and it was impossible to know whether or not I was in earnest.  
For several days after our memorable halt, the slopes became more rapid—some were even of a most frightful character—almost vertical, so that we were forever going down into the solid interior mass. During some days, we actually descended a league and a half, even two leagues towards the centre of the earth. The descents were sufficiently perilous, and while we were engaged in them we learned fully to appreciate the marvelous coolness of our guide, Hans. Without him we should have been wholly lost. The grave and impassible Icelander devoted himself to us with the most incomprehensible sang-froid and ease; and, thanks to him, many a dangerous pass was got over, where, but for him, we should inevitably have stuck fast.
 
His silence increased every day. I think that we began to be influenced by this peculiar trait in his character. It is certain that the inanimate objects by which you are surrounded have a direct action on the brain. It must be that a man who shuts himself up between four walls must lose the faculty of associating ideas and words. How many persons condemned to the horrors of solitary confinement have gone mad—simply because the thinking faculties have lain dormant!
 
During the two weeks that followed our last interesting conversation, there occurred nothing worthy of being especially recorded.
 
I have, while writing these memoirs, taxed my memory in vain for one incident of travel during this particular period.
 
But the next event to be related is terrible indeed. Its very memory, even now, makes my soul shudder, and my blood run cold.
 
It was on the seventh of August. Our constant and successive descents had taken us quite thirty leagues into the interior of the earth, that is to say that there were above us thirty leagues, nearly a hundred miles, of rocks, and oceans, and continents, and towns, to say nothing of living inhabitants. We were in a southeasterly direction, about two hundred leagues from Iceland.
 
On that memorable day the tunnel had begun to assume an almost horizontal course.
 
I was on this occasion walking on in front. My uncle had charge of one of the Ruhmkorff coils, I had possession of the other. By means of its light I was busy examining the different layers of granite. I was completely absorbed in my work.
 
Suddenly halting and turning round, I found that I was alone!
 
"Well," thought I to myself, "I have certainly been walking too fast—or else Hans and my uncle have stopped to rest. The best thing I can do is to go back and find them. Luckily, there is very little ascent to tire me."
 
I accordingly retraced my steps and, while doing so, walked for at least a quarter of an hour. Rather uneasy, I paused and looked eagerly around. Not a living soul. I called aloud. No reply. My voice was lost amid the myriad cavernous echoes i............