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Rh walls grew vast masses of those delicate light-giving fungous rootlets, the glow of which was so strong that I had no difficulty in reading the writing on my tablets; in fact, I stood there for several minutes making entries by the light of these bunches of glowing rootlets.

Then the thought flashed through my mind,—

“Which way shall I turn, to the right or to the left?”

Bulger comprehended the cause of my vacillation and made haste to come to my rescue. After sniffing the air, first in one direction and then in the other, he chose the right hand, and I followed without a thought of questioning his wisdom. Strange to say, he had not advanced more than a few hundred rods before I noticed that there was a strong current of air blowing through the tunnel in the direction Bulger had taken.

Every moment it increased in violence, fairly lifting us from our feet and bearing us along through this narrow bore made by nature’s own hands and lighted too by lamps of her own fashioning. The motion of the air through this vast pipe caused bursts of mighty tones as if peeled forth by some gigantic organ played by giant hands. It was strange, but yet I felt no terror as I listened to this unearthly music, although its depth of tone jarred painfully upon my ear-drums.

By the dim light of the luminous rootlets, I could see Bulger just ahead of me, and I was content. No shiver of fear ran down my back, or robbed my limbs of their full power to resist the ever-increasing pressure of the air. But as it grew stronger and stronger, half of my own accord and half because Bulger set the example, I broke into a run. Our pace once quickened it was impossible for me to slow up again. On, on, in a mad race, my feet scarcely touching the bottom of the tunnel, I sped along, while the great pipe through which I was borne on the very wings of the gale sent forth its deep and majestic peal.

There was something strangely and mysteriously exciting in this race, and all that kept me from enjoying it to my full bent was the thought that a sudden increase in the violence of the