There are some fish-like animals, say our Darwinian systematizers, like the Lepidosirens and their congeners, with the characteristics of amphibians; and hence they infer that by successive deviations and improvements the lower order has risen into the higher. But out of what page in the volume of nature, in the countless leaves we have turned back, has the immediate congener dropped, that we are obliged to look for the relationship in thirty-fourth cousins? We might as well say that some of the _Infusoria_ possess the same or similar characteristics, and predicate relationship between them and the amphibians; for giants sometimes spring from dwarfs and dwarfs from giants. At all events, our diagnoses must be freed from these intermediate breaks or failures in the chain of continuity, or the doctrine of descent must tumble with the imaginary foundations on which it is built. And bear in mind that the most enthusiastic Darwinist is forced to admit that there are still rigid partitions between the lower and higher organisms that have not been pierced by the light of scientific truth, but they assume that future discoveries and investigations will solve the difficulty. But science, inflexible as she is, or ought to be, in her demands, admits of no assumptions, much less sanctions such exceptions and deviations as we constantly find in the Darwinian path of continuity. The eye of imagination can supply nothing to her vision. She is eagle-eyed, and soars into the bright empyrean--does not dive into quagmires and the slime of creation after truth. But let us see how Mr. Darwin bridges one of the very first chasms he meets with in constructing his chain of generation. He goes back to the first link, or to what he calls primordial generation. Here the leap is from inorganic matter to the lowest form of organic life--from inanimate to animate dust. The chasm is immense, as all will agree. But he bridges it by falling back on his infinitessimal whirligig--his _primum mobile_--or on the motions of elements as yet inaccessible, except to the eye of imagination. For even Plato's monad, or ultimate atom, was not matter itself, being indivisible, but rather a formal unit or primary constituent of matter, which, like Mr. Darwin's whirligig in its unaggregated form, admits of neither a maximum nor a minimum of comprehension; but rests entirely on imaginary hypothesis. And we may here add that a system which begins in imaginary hypotheses and ends in them--as that of bridging the chasmal difference between a gorilla and a Plato--can be dignified into a science only by a still greater stretch of the imagination--that of bridging the difference between the Darwinian zero and his ninety degrees of development in a Darwin himself!