It should be observed that the northern
..| ..... 1866 | | species and 1859 1860 1861 |
| mountain-ranges 1866 | | southern parts 1859 1860 1861 |
| OMIT 1866 |
| southern hemisphere, and on the mountain-ranges of the 1859 1860 1861 |
| regions 1866 | | regions, 1859 1860 1861 |
| and in 1866 |
| are not arctic, but belong to 1859 1860 1861 |
| southern 1866 | | northern 1859 1860 1861 |
| parts of the southern hemisphere are not arctic, but belong to the temperate 1866 |
| temperate 1859 1860 1861 |
| zones: 1866 | | zones. 1859 1860 1861 |
| "in 1866 | | "In 1859 1860 | | "In 1861 |
| arctic." 1859 1860 1866 | | arctic." 1861 |
| Of these forms, some few are identical with northern temperate species, or are varieties of them, whilst others are 1866 |
| Many of the forms living on the mountains of the warmer regions of the earth and in the southern hemisphere are of doubtful value, being 1859 1860 |
| Many of the forms living on the mountains of the warmer reigons of the earth and in the southern hemisphere are of doubtful value, being 1861 |
| all 1866 | | some 1859 1860 1861 |
| closely allied to, but specifically distinct from, their northern representatives. 1866 |
| specifically distinct, by others as varieties; but some are certainly identical, and many, though closely related to northern forms, must be ranked as distinct species. 1859 1860 1861 |
|
Now let us see
what light can be thrown | what light can be thrown 1859 1860 1861 1866 |
| whether Mr. Crolls conclusion that when the northern hemisphere suffered from the extreme cold of the great Glacial period, the southern hemisphere was actually warmer, throws any clear light 1869 |
| whether Mr. Croll's conclusion that when the northern hemisphere suffered from the extreme cold of the great Glacial period, the southern hemisphere was actually warmer, throws any clear light 1872 |
| foregoing facts, on the belief, supported as it is by a large body of geological evidence, that the whole world, or a large part of it, was simultaneously colder during the Glacial period than at present. 1866 |
| foregoing facts, on the belief, supported as it is by a large body of geological evidence, that the whole world, or a large part of it, was during the Glacial period simulta- neously much colder than at present. 1859 |
| foregoing facts, on the belief, supported as it is by a large body of geological evidence, that the whole world, or a large part of it, was during the Glacial period simultaneously much colder than at present. 1860 1861 |
| present apparently inexplicable distribution of various organisms in the temperate parts of both hemispheres, and on mountains of the tropics. 1869 |
| present apparently inexplicable distribution of various organisms in the temperate parts of both hemispheres, and on the mountains of the tropics. 1872 |
| came slowly on, the tropical plants and animals will have retreated from both sides towards the equator, followed in the rear by 1866 |
| came slowly on, all the tropical plants and other productions will have retreated from both sides towards the equator, followed in the rear by 1859 1860 1861 |
| became more and more intense, we know that Arctic forms invaded 1869 1872 |
| productions, 1859 1860 1861 1866 | | regions; 1869 1872 |
| and 1859 1860 1861 1866 | | and, 1869 1872 |
| these by the arctic; but with the latter we are not now concerned. 1859 1860 1861 1866 |
| from the facts just given, there can hardly be a doubt that some of the more vigorous, dominant, and widest-spreading temperate forms actually then invaded the equatorial lowlands. 1869 |
| from the facts just given, there can hardly be a doubt that some of the more vigorous, dominant and widest-spreading temperate forms invaded the equatorial lowlands. 1872 |
|
