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Professor Owen, in 1849 (^ Nature of Limbs,' p. 86), wrote as follows :-“ The archetypal idea was manifested in the flesh under such diverse modifications, upon this planet, long prior to the existence of those animal species that actually exemplify it. To what natural laws or secondary causes the orderly succession and progression of such organic phenomena may have been committed, we, as yet, are ignorant.” In his Address to the British Association, in 1858, he speaks (page li.) of the axiom of the continuous operation of creative power, or of the ordained becoming of living things.” Farther on (p. xc.), after referring to geographical distribution, he adds, “ These phenomena shake our confidence in the conclusion that the Apteryx of New Zealand and the Red Grouse of England were distinct creations in and for those islands respectively. Always, also, it may be well to bear in mind that by the

word creation’the zoologist means ' a process he knows E not what.' He amplifies this idea by adding, that when

such cases as that of the Red Grouse are enumerated by the zoologist as evidence of distinct creation of the bird in and for such islands, he chiefly expresses that he knows not how the Red Grouse came to be there, and there exclusively; signifying also by this mode of expressing such ignorance his belief, that both the bird and the islands owed their origin to a great first Creative Cause.”

M. Isidore Geoffroy Saint Hilaire, in his Lectures delivered in 1850 (of which a Résumé appeared in the

Revue et Mag. de Zoolog.,' Jan. 1851), briefly gives his reason for believing that specific characters sont fixes,

pour chaque espèce, tant qu'elle se perpétue au milieu À des mêmes circonstances : ils se modifient, si les circonistances ambiantes viennent à changer.” En résumé,

l'observation des animaux sauvages démontre déjà la [ variabilité limitée des espèces. Les expériences sur les ! animaux

sauvages devenus domestiques, et les animaux domestiques redevenus sauvages, la démontrent s plus clairement encore. Ces mêmes expériences prouvent,

de plus, que les différences produites peuvent être de valeur générique." In his ‘Hist. Nat. Générale' (tom. ii. p. 430, 1859) he amplifies analogous conclusions.

From a circular lately issued it appears that Dr. Freke, in 1851 (' Dublin Medical Press,' p. 322), propounded the Ć doctrine that all organic beings have descended from one primordial form. His grounds of belief and treatment

of the subject are wholly different from mine; but as

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Dr. Freke has now (1861) published his Essay on the In Origin of Species by means of Organic Affinity,' the 'Bu difficult attempt to give any idea of his views would be • sugg superfluous on my part.

Mr. Herbert Spencer, in an Essay (originally published the in the ‘Leader,' March, 1852, and republished in his spec ' Essays' in 1858), has contrasted the theories of the bien Creation and the Development of organic beings with sive remarkable skill and force. He argues from the analogy

Ir of domestic productions, from the changes which the embryos of many species undergo, from the difficulty of Preu distinguishing species and varieties, and from the principle prog of general gradation, that species have been modified ;

He i and he attributes the modification to the change of whe circumstances. The author (1855) has also treated spec Psychology on the principle of the necessary acquirement gra of each mental power and capacity by gradation.

not In 1852 (* Revue Horticole,' p. 102) M. Naudin, a dis

to tinguished botanist, has expressly stated his belief that rep species are formed in an analogous manner as varieties

T are under cultivation; and the latter process he attributes to man's power of selection. But he does not show how selection acts under nature. He believes, like Dean

stri Herbert, that species, when nascent, were more plastic

inti than at present. He lays weight on what he calls the pho principle of finality," puissance mystérieuse, indéterminée ; fatalité pour les uns ; pour les autres, volonté providentielle, dont l'action incessante sur les êtres vivants détermine, à toutes les époques de l'existence du monde, la forme, my le volume, et la durée de chacun d'eux, en raison de sa

to destinée dans l'ordre de choses dont il fait partie. C'est pro cette puissance qui harmonise chaque membre à l'ensemble

cle en l'appropriant à la fonction qu'il doit remplier dans l'organisme général de la nature, fonction qui est pour

th lui sa raison d'être."*

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to * From references in Bronn's ‘Untersuchungen über die Entwickelungs-Gesetze' it appears that the celebrated botanist and

gr palæontologist Unger published, in 1852, his belief that species undergo development and modification. D’Alton, likewise, in Pander and d’Alton's work on Fossil Sloths, expressed, in 1821, SE a similar belief. Similar views have, as is well known, been main di tained by Oken in his mystical ‘Natur-Philosophie.' From other references in Godron's work 'Sur l'Espèce,' it seems that Borys si St. Vincent, Burdach, Poiret, and Fries, have all admitted that b. new species are continually being produced.

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In 1853, a celebrated geologist, Count Keyserling (* Bulletin de la Soc. Géolog.,' 2nd Ser., tom. x. p. 357), suggested that as new diseases, supposed to have been caused by some miasma, have arisen and spread over the world, so at certain periods the germs of existing species may have been chemically affected by circumambient molecules of a particular nature, and thus have given rise to new forms.

In this same year, 1853, Dr. Schaaffhausen published an excellent pamphlet (* Verhand. des Naturhist. Vereins der Preuss. Rheinlands,' &c.), in which he maintains the progressive development of organic forms on the earth. He infers that many species have kept true for long periods, whereas a few have become modified. The distinction of species he explains by the destruction of intermediate graduated forms. Thus living plants and animals are not separated from the extinct by new creations, but are to be regarded as their descendants through continued reproduction.”

The ‘Philosophy of Creation' has been treated in a masterly manner by the Rev. Baden Powell, in his ' Essays on the Unity of Worlds, 1855. Nothing can be more striking than the manner in which he shows that the introduction of new species is “ a regular, not a casual phenomenon," or, as Sir John Herschel expresses it, not

a natural in contra-distinction to a miraculous process.”

The third volume of the Journal of the Linnean Society' contains papers, read July 1st, 1858, by Mr. Wallace and myself, in which, as stated in the introductory remarks to this volume, the theory of Natural Selection is promulgated by Mr. Wallace with admirable force and clearness.

In June, 1859, Professor Huxley gave a lecture before the Royal Institution on the ‘Persistent Types of Animal Life.' Referring to such cases, he remarks, “ It is difficult to comprehend the meaning of such facts as these, if we suppose that each species of animal and plant, or each great type of organisation, was formed and placed upon

I may add, that of the thirty authors named in this Historical Sketch, who believe in the modification of species, or at least disbelieve in separate acts of creation, twenty-five have written on special branches of natural history • of these only three are simple geologists, nine are botanists, and thirteen zoologists ; but several of the botanists and zoologists have written on palæontology or on geology.

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the surface of the globe at long intervals by a distinct act of creative power; and it is well to recollect that such an assumption is as unsupported by tradition or revelation as it is opposed to the general analogy of nature. If, on the other hand, we view ‘Persistent Types' in relation to that hypothesis which supposes the species living at any time to be the result of the gradual modification of pre-existing species—a hypothesis which, though unproven, and sadly damaged by some of its supporters, is yet the only one to which physiology lends any countenance; their existence would seem to show that the amount of modification which living beings have undergone during geological time is but very small in relation to the whole series of changes which they have suffered.”

In December, 1859, Dr. Hooker published his ' Introduction to the Australian Flora.' In the first part of this great work he admits the truth of the descent and modification of species, and supports this doctrine by many original observations.

The first edition of this work was published on November 24th, 1859, and the second edition on January 7th, 1860.

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ABERRANT groups, 365.

Australia, animals of, 108.
Abyssinia, plants of, 325.

dogs of, 196.
Acclimatisation, 136.

extinct animals of, 294.
Affinities of extinct species, 285.

European plants in, 322.
of organic beings, 351.

Azara on Aies destroying cattle, 72.
Agassiz on Amblyopsis, 136.

Azores, flora of, 313.
on groups of species suddenly ap-
pearing, 271.

on embryological succession, 294. BABINGTON, Mr., on British plants, 53.
- on the glacial period, 315.

Baer, Von, standard of Highness, 117.
on embryological characters, 356.

-comparison of bee and fish, 292.
on the latest tertiary forms, 260.

embryonic similarity of the verte-
parallelism of embryological brata, 372.
development and geological succes Balancement of growth, 141.

sion, 380.
Algæ of New Zealand, 323.

Barberry, flowers of, 93.

Barrande, M., on Silurian colonies, 273.
Alligators, males, fighting, 86.

on the succession of species, 282.
Amblyopsis, blind fish, 136.

on parallelism of palæozoic forma-
America, North, productions allied to

tions, 285.
those of Europe, 315.
boulders and glaciers of, 321.

Barrande on affinities of ancient species

286.
South, no modern formations
west coast, 252.

Barriers, importance of, 301,
Ammonites, sudden extinction of, 279,

Batrachians on islands, 336.
Anagallis, sterility of, 221.

Bats, how structure acquired, 167.
Analogy of variations, 153.

distribution of, 338.
Ancylus, 331.

Bear, catching water-insects, 169.
Animals, not domesticated from being

Bee, sting of, 185.
variable, 27.

queen, killing rivals, 185.
domestic, descended from several

Bees fertilising flowers, 73.
stocks, 28.

- hive, not srcking the red clover,

91.
acclimatisation of, 137.
of Australia, 108.

- hive, cell-making instinct, 202.
with thicker fur in cold climates, 131.

variation in habits, 193.
blind, in caves, 133.

humble, cells of, 203.
extinct, of Australia, 294.

- parasitic, 198.
Anomma, 216.

Beetles, wingless, in Madeira, 132.
Antarctic islands, ancient flora of, 341,

with deficient tarsi, 132.
Antirrhinum, 152.

Bentham, Mr., on British plants, 53.
Ants, attending aphides, 192.

on classification, 357.
slave-making instinct, 198.

Berkeley, Mr., on seeds in salt-water, 309.
neuter, structure of, 212.

Bermuda, birds of, 335.
Aphides, attended by an ts, 192.

Birds acquiring fear, 193.
Aphis, development of, 375.

annually cross the Atlantic, 314.
Apteryx, 168.

colour of, on continents, 130.
Arab horses, 41.

footsteps and remains of, in secondary
Aralo-Caspian Sea, 295.

rocks, 266.
Archiac, M. de, on the succession of fossil, in caves of Brazil, 294.
species, 282.

of Madeira, Bermuda, and Gala-
Artichoke, Jerusalem, 138.

pagos, 335.
Ascension, plants of, 334.

song of males, 86.
Asclepias, pollen of, 178.

transporting seeds, 311.
Asparagus, 310.

waders, 331.
Aspicarpa, 356.

wingless, 131, 168.

with traces
Asses, striped, 154.

of embryonic teeth
improved by selection, 47.

381.
Ateuchus, 132.

Bizcacha, 302.
Audubon on habits of frigate-bird, 171.

affinities of, 365.
on variation in birds' nests, 1926 Bladder for swimming in fish, 176.
on heron eating seeds, 332.

Blindness of cave animals, 133.

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