CHAPTER VT. 
THE EYELESS FISHES OF THE CAVE. 
As an interlude to the descriptive narrative 
of the scenery observed in our journey through 
the Cave, we will stop here to note the existence 
of animal life, which is remarkable for maintain- 
ing vitality under circumstances so unfavorable 
for normal development. There are to be found 
in the Cave eyeless fish, eyeless crawfish, lizards, 
frogs, crickets, rats, bats, etc.,—all, except the 
two first named, being possessed of more or less 
development of the visual organs. 
In Echo River we find the eyeless fish and 
the eyeless crawfish. These specimens of the 
fish tribe have been looked upon by all classes 
of persons, ever since the first published notice 
of their existence, as remarkable curiosities. 
They illustrate, however, a fixed rule in the 
great laws of Nature. The presiding Deity 
never supplies any living creature with super- 
fluous organs; and if organs already exist which 
future circumstances render useless, they are 
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