And as all these were only varieties of the same breed, they would breed together, and thus still more confuse the complexity, and render distinction of species impossible.

For, in spite of all Mr.Darwin has to say about the extinction of the weaker varieties, the fact is, they are not at all extinguished, but keep their ground as well as the higher classes, or perhaps better.

And if a snail, or a worm, can contrive to live now in an unimproved condition, why should its improving cousin die off?
Did its improvement kill it?
And so of improving mollusks, and well-doing radiates, and aspiring rabbits, and all the rest.

The world ought to be so full of them that no man could sort them off into species, or tell which was fish, which was flesh, and which red herring; and no pork packer could distinguish hog from dog.
But instead of any such horrible confusion of a world full of mongrels, we discover a clear and well defined distinction of species, known even to the poor animals themselves, and by their instincts made known to all mankind.

The Creator, who created all creatures after their kind, implanted in them an instinct of breeding only with their own species; and placed a bar in the way of man's vain attempts to work confusion of species, by rendering the hybrid offspring of different species sterile, or only capable of breeding back to the pure blood.