Origin of Species Variorum

→ the several distinct 1861 1866 1869

that the 1872

→ has remarked, inhabit several distinct European caves and likewise those of Kentucky, and the genus is 1861 1866 1869

observes, have not as yet been 1872

→ but 1861 1866 1869

yet those which inhabit the several caves of Europe and America are distinct; but 1872

→ whilst furnished with eyes, formerly may 1866 1869

may formerly 1861

whilst they were furnished with eyes, may formerly 1872

→ then have 1869 1872

have since (like the elephant on both continents) 1861

since (like the elephant on both continents) have 1866

→ 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

→ if it be true 1869 1872

and as I believe 1859 1860 1861 1866

→ parent-form, 1869 1872

parent, if this view be correct, 1859 1860 1861 1866

→ a long course of 1869 1872

long-continued 1859 1860 1861 1866

this remarkable

peculiarity,

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

anywhere

nowhere

except in

caves,

caves;

→but it is possible that the

progenitors

progenitor

~~or progenitors~~

or progenitors

of these several

species

species,

→whilst furnished with eyes, formerly may have ranged

~~widely~~

widely

over both continents, and →then have become extinct, excepting in their present secluded

habitations.

abodes.

Far from feeling

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 probably

will

must

have been exposed.

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

....

hot and

very

....

cold countries, →if it be true that all the species of the same genus

have

are

descended from a single →parent-form, acclimatisation must be readily effected during →a long course of 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. We may infer this from our frequent inability to predict whether or not an