When Dr Carpenter tells us, in exemplifying this law of unity of composition, that "the skull is but an expansion of the three highest vertebræ, modified to afford space for the development of the contained brain and of the organs of sense," p. 191—is he much wiser than those entomologists whom he had been previously criticising for "maintaining that the wing of an insect is a modification of its leg?" Verily we suspect that if Martinus Scriblerus had had his attention drawn to this manner of viewing things, it would have greatly excited his learned ingenuity; he would probably have begun to apply this scientific method to a variety of things, and found a unity of composition never before dreamt of. What should have prevented him from casting a philosophic glance upon the furniture of his room? With less ingenuity than certain physiologists, he would easily detect a marvellous unity of plan. He would have probably taken the table with its four legs, and the disk they support, as his great type of joinery, and would have traced a modification of this type in all the articles around him. The chair is manifestly nothing else than the table, with a development of the hinder legs commonly called the back. From the chair to the sofa the transition would be ridiculously easy; indeed the sofa can only be considered as a variety of the chair, produced by a high state of cultivation. In the footstool, or ottoman, the disk of the table has become thick and pulpy, while its legs have dwindled into small globular supports. This exaggeration of the upper portion at the expense of the lower, is carried a step further in the chest of drawers, where the small globular supports bear a singular disproportion to the corpulent figure they sustain. In some varieties even these knob-like legs are wanting; but precisely in these cases, he would observe, the knobs invariably re-appear in the shape of handles, which are still a sort of paw. What is the fire-screen, he would say, but a table with the disk in a vertical position? What the four-post bedstead but a reduplication of the original type, a table placed on a table, the upper one being laid open? If he had had the advantage of reading Mr Dickens, he would have mentioned, in confirmation of this view, that young Mr Weller, when sleeping under a table, congratulates himself upon enjoying the luxury of a four-post bedstead. The coal-scuttle might perhaps present some difficulties; but if he might be allowed to approach it through the loo-table, he would doubtless succeed in tracing here also the unity of composition. In the loo-table the four legs have collapsed into a central column! The coal-scuttle is only a loo-table with the edges of the disk curled up—assuming a bonnet-like shape, the result, perhaps, of its long domesticity. In short, we believe the only insuperable difficulty Martin would encounter, would be, when, after having completed his survey, he would run off to the joiner to convince him of the unity of plan on which he had been so unconsciously working.

It was a bold step of our author's to adduce the geographical distribution of the several species of animals as a proof of his law of development. To most minds it would have immediately occurred as an objection. Each region of the earth has its own peculiar fauna, and this difference is not accountable on any known influence of soil or climate. What can explain the peculiar fauna of New Holland? If all the varieties of animal life spring from one and the same germ under the uniform laws of nature, how is it that in some regions, fitted in every respect for the support of animal life, no animals whatever of the higher order are found? "New Zealand, which may be compared in dimensions to Ireland united with Scotland, which extends over more than 700 miles in latitude, and is in its many parts 90 miles broad, with varied stations, a fine climate, and land of all heights, from 14,000 feet downwards, does not possess one indigenous quadruped, with the exception of a small rat."—Lyell's Principles of Geology, Vol. i. p. 102. Other instances equally striking might be mentioned. How are we to explain them upon our author's hypothesis? Are we to make supposition upon supposition, and presume that the land of New Zealand had not been long enough emerged from the sea to allow of the ample development of the original germ of life; and that, if the rat had been left to himself, he would in process of time have peopled the whole region with dogs, and horses, and oxen, or some other analogous quadrupeds?

But our readers have perhaps heard sufficient of an hypothesis which is built only on a series of conjectures, and we ourselves are wearied with a too easy victory. There are many other topics in the book which would far better reward discussion than the one we have chosen—as, for instance, the geological views here put forward, the claims of phrenology, and the difference between instinct and intelligence; but if disposed to treat these subjects, we could have found other and more suitable opportunities; we thought it fit to select that which forms the peculiarity of the present work.

But absurd as the matter is, we must complete the account which the author gives of the development of that race in which we are chiefly interested—man. We have seen, that according to his law of progressive generation, and as an instance of what he denominates "a modest and simple phenomenon," man was one day born of the monkey or the ape. But this discovered law has not only thus happily introduced the human being upon the earth, it also throws light upon the diversities which exist in the family of man.

"The causes of the various external peculiarities of mankind, now require some attention. Why, it is asked, are the Africans black, and generally marked by ungainly forms? Why the flat features of the Chinese, and the comparatively well-formed figures of the Caucasians? Why the Mongolians generally yellow, the Americans red, and the Canadians white? These questions were complete puzzles to all early writers; but physiology has lately thrown a great light upon them. It is now shown that the brain, after completing the series of animal transformations, passes through the characters in which it appears in the Negro, Malay American, and Mongolian nations, and finally becomes Caucasian. The face partakes of these alterations. The leading characters, in short, of the various races of mankind, are simply representations of particular states in the development of the highest or Caucasian type. The Negro exhibits permanently the imperfect brain, projecting lower jaw,[5] and slender bent limbs of a Caucasian child some considerable time before the period of its birth. The aboriginal American represents the same child nearer birth. The Mongolian is an arrested infant newly born. And so forth."

So that we Caucasians are, at least, the only full grown children: all others are more or less abortions. Indeed we might be described, in the language of this theory, as the only animals on the face of the earth who pass through the full period of gestation. And yet even this honour may be disputed; perhaps we ourselves are but imperfect developments of that germ of life which is the progenitor of us all. The author darkly intimates that we may be supplanted from our high place in this world, that another and more powerful and sagacious race may be born of us, who may treat us no better than we have treated the monkeys and other species of the brute creation. This is the severest blow of all. After having humbled our pride according to this philosopher's bidding, and taught ourselves to look upon the ape with due feelings of filial respect—after having acknowledged some sturdy baboon for our only Adam, and some malicious monkey for our sweet mother Eve—after having brought ourselves to see in the lower animals the same mental and moral faculties which we boast of, and to confess that the same psychology applies to both, with a slight modification in our theory of the origin of ideas—after having practised all this condescension, to be threatened with complete dethronement from our high place in the world!—to be told that we, too, shall have to obey a master who may govern us as man governs the horse! What a millennium to look forward to!

"Is our race but the initial of the grand crowning type? Are there yet to be species superior to us in organization, purer in feeling, more powerful in device and art, and who shall take a rule over us? There is in this nothing improbable on other grounds. The present race, rude and impulsive as it is, is perhaps the best adapted to the present state of things in the world; but the external world goes through slow and gradual changes, which may leave it in time a much serener field of existence. There may then be occasion for a nobler type of humanity, which shall complete the zoological circle on this planet, and realize some of the dreams of the purest spirits of the present race."—P. 276.

Melancholy prospect for man! When the earth becomes a serener field of existence, then will a race appear to take rule over him. Might not he become serener too? Is it thus that are to be solved all our social problems, all our discussions upon the perfectibility of man, all our vague but obstinate prophecies of some more rational and happier scheme of existence? This homo is to survive, it seems, only to make railroads for the future angelus.

On the authorship of this production we have no communication or conjecture to make. The writer has been successful, as far as we know, in preserving his incognito; and as the rumours that have reached our ear have all been again contradicted, we think it wisest to abstain from circulating any of then. We heard it pleasantly said that the author had been followed down as far as Lancashire, and that then all further trace of him had been lost. We think he might be traced further north than Lancashire. The style in one or two places bears symptoms of a Scottish origin. Occupied with the wild theory it promulgates, we have not said much of the literary merits of the work. Nor is there much to say. It is written in a clear, unpretending style, but somewhat careless and inexact. The exposition in the first portions of the work, the astronomical and geological, appeared to us particularly good. The author's knowledge of science is such as is gleaned by that sort of student who is denominated, in prefaces, the general reader; he is not, we should apprehend, a labourer in any one of its departments, but thankfully receives whatever is brought to his door of the results of science. With this chance-gathered stock he has ventured to frame, or rather to defend, his speculations. The sudden success of the work is not, we think, what any one could have prognosticated. It is a success which its singularity has gained for it, and which its superficiality will soon again forfeit.

We may mention that this notice was written after a perusal of the first edition. In the third edition, we observe that some passages have been slightly modified or omitted; but the hypothesis put forward is substantially the same.