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Updated: May 5, 2025


Haeckel’s demonstration of the possibility of spontaneous generation is along these lines. He refers to the cytodes, the blood corpuscles, to alleged or actual non-nucleated cells, to bacteria, to the simplest forms of cell-structure, as proofs of the possibility of a descending series of connecting-links. Unfortunately, this primitive slime soon proved itself an illusion.

The figures, fewer in number than in the "Disputa" and confined to the lower half of the composition, are ranged in two long lines across the picture; but the nearer line is broken in the centre and the two figures on the steps, serving as connecting-links between the two ranks, give to the whole something of that semicircular grouping so noticeable in the companion picture.

The above-mentioned animal is found in Australia, the land of many strange forms and "connecting-links," which have survived there while in other parts of the globe they have vanished gradually from existence, crowded out by the more perfectly evolved forms. Darwin has called these surviving forms "living fossils."

Even if it be granted that the difference between man and his nearest allies is as great in corporeal structure as some naturalists maintain, and although we must grant that the difference between them is immense in mental power, yet the facts given in the earlier chapters appear to declare, in the plainest manner, that man is descended from some lower form, notwithstanding that connecting-links have not hitherto been discovered.

It has been proven that Crows are capable of counting up to several figures, and in other ways they display a wonderful degree of almost human sagacity. Next above the Bird family comes the highest form of all the Mammals. But before we begin our consideration of these high forms, let us take a hasty glance at the "connecting-links" between the Birds and the Mammals.

So you see that without leaving the fish family proper, we have examples of land living creatures which are akin to "connecting links." But there are real "connecting-links" between the Fish and the Reptiles. Passing over the many queer forms which serve as links between the two families, we have but to consider our common frog's history for a striking example.

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