This gorge is half filled by a glacier; on the surface of which you may pass for a certain distance downward.

At the end of that descent you will find the glacier cut by a deep crevasse, a hundred feet in depth and a hundred in width.

Without bridging the crevasse, you can go no further; and if you did succeed in bridging it, further down you would find others deeper and wider, over which it would be impossible for you to pass.
Return then, and examine the singular valley into which you have made your way.

You will find there trees of many kinds, quadrupeds of many kinds, birds of many kinds, and insects of many kinds--you will find every form of animal life, except that of the human being.

If you find not man, however, you may discover traces of him.