Origin of Species Variorum

→ at a very early age for their own wants, and 1869 1872

for their own wants at a very early stage of development, and secondly, 1859 1860 1861

at a very early stage of development for their own wants, and secondly, 1866

→ OMIT 1869 1872

exactly 1859 1860 1861

(and this might often be of advantage to a species) exactly 1866

→ OMIT 1869 1872

species, that the child 1859 1860 1861 1866

→ OMIT 1869 1872

at a very early age 1859 1860 1861 1866

→ as their parents. 1869 1872

with its parents, in accordance with their similar habits. 1859 1860 1861 1866

↑ 1 blocks not present in 1859 1860 1861 1869; present in 1866 1872

Again, with respect to the singular fact of so many terrestrial and fresh-water animals not undergoing any metamorphosis, whilst the marine members of the same classes pass through various transformations, Fritz Müller has suggested that if an animal during a long succession of generations had to change its habits from living in the sea to living on the land or in fresh-water, it would be a great advantage to its descendants during their modification if they were to lose their metamorphoses; for it is not probable that places well adapted for both the larval and mature stages, under such new and greatly changed habits of life, could be found unoccupied or ill-occupied by other organisms.

→ In this case 1869

Therefore the modification of a marine animal into a terrestrial or fresh-water one would generally be much more easily effected, if its metamorphoses were suppressed through 1866

→ structure would be favoured by natural selection, and all traces of former metamorphoses would finally be lost. 1869

structure. 1866

→ Again, with respect to the singular fact of so many terrestrial and fresh-water animals not undergoing any metamorphosis, whilst marine members 1869

In this case the gradual acquirement at an earlier and earlier age 1872

→ same groups pass through various transformations, Fritz Müller has suggested that the process of slowly modifying and adapting an animal to live on the land or in fresh water, instead of in the sea, 1869

adult structure 1872

→ greatly simplified by its not passing through any larval stage; for it is not probable that places well adapted for both the larval and mature stages, under such new and greatly changed habits of life, could be found unoccupied or ill-occupied by other organisms. 1869

favoured by natural selection; and all traces of former metamorphoses would finally be lost. 1872

→ of an animal to 1869 1872

to 1859 1860 1861

→ slightly 1869 1872

in any degree 1859 1860 1861

→ manner, 1859 1860 1861 1869

plan, or if it profited a larva already different from its parent to change still further, 1872

→ or if it profited a larva already widely different from its parent to change still further, then, 1869

then, 1859 1860 1861 1872

→ the larvæ might 1869 1872

larvæ might easily 1859 1860

larvæ might 1861

→ more and more different 1869 1872

different to any conceivable extent 1859 1860 1861

→ parents to any conceivable extent. 1869 1872

parents. 1859 1860 1861

→ in the larvæ might, 1869

might, 1859 1860 1861

in the larva might, 1872

→ come to differ 1869 1872

differ 1859 1860 1861

→ is 1869 1872

we have seen to be 1859 1860 1861

→ OMIT 1869 1872

said to be 1859 1860 1861

→at a very early age for their own wants, and from their following →OMIT the same habits of life with their parents; for in this case, it would be indispensable for

the

their

existence

that

the

they

→OMIT should be modified →OMIT in the same manner →as their parents. ↑ →In this case the gradual acquirement at an earlier and earlier age of the adult → structure would be favoured by natural selection, and all traces of former metamorphoses would finally be lost. →Again, with respect to the singular fact of so many terrestrial and fresh-water animals not undergoing any metamorphosis, whilst marine members of the →same groups pass through various transformations, Fritz Müller has suggested that the process of slowly modifying and adapting an animal to live on the land or in fresh water, instead of in the sea, would be →greatly simplified by its not passing through any larval stage; for it is not probable that places well adapted for both the larval and mature stages, under such new and greatly changed habits of life, could be found unoccupied or ill-occupied by other organisms. If, on the other hand, it profited the young →of an animal to follow habits of life →slightly different from those of

their parent,

the parent-form,

and consequently to be constructed

a slightly different →manner, →or if it profited a larva already widely different from its parent to change still further, then, on the principle of inheritance at corresponding ages, the

active

....

young or →the larvæ might be rendered by natural selection →more and more different from their →parents to any conceivable extent.

Such

....

differences

Differences

→in the larvæ might, also, become correlated with successive stages of

its development;

development;

so that the

larvæ