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1859
1860
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1866
1869
1872

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1860
1861
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1872

2 blocks not present in 1859 1860; present in 1861 1866 1869 1872
As a blind species of Bathyscia is found in abundance on shady rocks out of the caves, the loss of vision in the cave-species has probably had no relation to its dark habitation; and it is very natural that an insect already deprived of vision should readily become adapted to dark caverns. Another blind genus (Anophthalmus) offers this remarkable peculiarity: the several distinct species, as Mr. Murray has remarked, inhabit several distinct European caves and likewise those of Kentucky, and the genus is found nowhere except in caves; but it is possible that the progenitor or progenitors of these several species may formerly have ranged widely over both continents, and have since (like the elephant on both continents) become extinct, excepting in their present secluded habitations.

rain requisite for seeds to germinate, 1859 1860 1861 1866 1869
sleep, 1872

sleep, 1859 1860 1861 1866 1869
rain requisite for seeds to germinate, 1872

species of 1859 1860 1861 1866 1869
distinct species belonging to 1872

and as I believe 1859 1860 1861 1866
if it be true 1869 1872

parent, if this view be correct, 1859 1860 1861 1866
parent-form, 1869 1872

long-continued 1859 1860 1861 1866
a long course of 1869 1872

Professor Dana; and some of the European cave-insects are very closely allied to those of the surrounding country. It would be
most
most
difficult to give any rational explanation of the affinities of the blind cave-animals to the other inhabitants of the two continents on the ordinary view of their independent creation. That several of the inhabitants of the caves of the Old and New Worlds should be closely related, we might expect from the well-known relationship of most of their other productions. Far from feeling
any
any
surprise that some of the cave-animals should be very anomalous, as Agassiz has remarked in regard to the blind fish, the Amblyopsis, and as is the case with the blind Proteus with reference to the reptiles of Europe, I am only surprised that more wrecks of ancient life have not been preserved, owing to the less severe competition to which the
scanty inhabitants
inhabitants
of these dark abodes
will
must
will probably
have been exposed.
Acclimatisation .
Acclimatisation .
Acclimatisation .—
Habit is hereditary with plants, as in the period of flowering, in the
time
amount
of rain requisite for seeds to germinate, in the
time
amount
time
of sleep, &c., and this leads me to say a few words on acclimatisation. As it is extremely common for species of the same genus to inhabit
very
very
hot and
very
very
cold countries, and as I believe that all the species of the same genus
are
have
descended from a single parent, if this view be correct, acclimatisation must be readily effected during long-continued descent. It is notorious that each species is adapted to the climate of its own home: species from an arctic or even from a temperate region cannot endure a tropical climate, or conversely. So again, many succulent plants cannot endure a damp climate. But the degree of adaptation of species to the climates under which they live is often overrated.