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Essay on The Orgin Of The Species By Charles Darwin (1809-1882)
| Date: |
06-19-03 6:42pm |
| Subject: |
Novels |
| Word Count: |
1212 |
| Page Count: |
4.85 |
The Orgin of the Species by Charles Darwin (1809-1882)
The Orgin of the
Species
by Charles Darwin (1809-1882)
Type of Work:
Natural history text
First Published
1859
Complete Title
The Origin of Species by Means of Natural
Selection , or the Preservation of Favored Races in the Struggle for Life
Book Historical Commentary
Charles Robert Darwin, the grandson of
the English scientist Erasmus Darwin, studied medicine at the University
of Edinburgh and prepared for the ministry at Cambridge. Following his
abiding interest in natural history, however, he became a naturalist and
sailed in this capacity on the H.M.S. Beagle from 1831 to 1838. The Beagle's
expedition took Darwin to various Southern Pacific islands and to the coasts
of South America and Australia.
Returning to England, Darwin became the
secretary of the Geological Society and, in 1840, published a treatise,
"Zoology of the Voyage of the Beagle." At this time he met Sir Charles
Lyell, who encouraged him to write about his inbreeding experiments and
to expound on his theory of evolution by natural selection.
Later, in 1844, Darwin received from a
fellow naturalist, Alfred Wallace, notes outlining a theory - parallel
to, but independent of, his own - on natural selection. Darwin carried
on his research and, in 1858, published an essay delineating his own evolutionary
theory along with Wallace's findings. The following year, The Origin of
Species appeared. The book's first edition sold out in one day, stirring
an immediate clamor of controversy. It is still recognized as one of the
most disputed yet important works of biological study
Darwin went on to publish The Movements
and Habits of Climbing Plants (1865), The Variation of Animals and Plants
Under Domestication (1868), The Descent of Man (1871), and Selection in
Relation to Sex (1871). The Origin of Species has powerfully influenced
nearly every contemporary field of scientific and philosophical study:
biology, literature, law, psychology, sociology, theology, and other fields
of intellectual pursuit.
Despite the length and weighty content
of Darwin's work, the text is remarkably easy reading. Unfortunately, through
all the tempest and fanfare that have followed it for almost one and a
half centuries, few have actually studied its pages.
Text Summary
Early on in Darwin's first five-year voyage
on the Beagle, he observed that, despite the distances between the remote
areas he visited, the varieties of flora and fauna he found were similar
in structure and function. This led him to develop his idea that species
were not immutable, but were forced to adapt to their ever-changing environments.
In his introduction to the first edition of The Origin of Species, Darwin
noted: "I was much struck with certain facts in the distribution of the
[plant and animal] inhabitants of South America, and in the geological
relations of the present to the past inhabitants of that continent. These
facts seemed to throw some light on the origin of the species - that mystery
of mysteries, as it has been called by one of our greatest philosophers."
After over twenty years of further research, Darwin published his findings.
Like all scientists, Darwin built his theory
upon those of his predecessors. However, scientific opinion was always
and remains - somewhat divided as to what contribution the theory makes
to the biological sciences. Throughout the book, Darwin openly admits to
the possibility of error and the need for further investigation; he is
careful to point out that the idea of evolution by natural selection is"one of long argument."
To comprehend the vast amount of information
contained in the work, one must examine it in its entirety. Still, this
sampling of chapter headings and brief content summaries may provide some
general information.
Chapter II: Variation
Under Nature
Variations within a species are indistinguishable
at first, but gradually may develop into differences that can restrict
one group', range or ability to obtain food or escape predators ... Thus,
"varieties tend to become converted into new and distinct species ... and
throughout nature the forms of life which are now dominant tend to become
still more dominant by leaving any modified and dominant descendants."
Chapter III: Struggle
for Existence
"... When a plant or animal is placed
in a new country amongst new competitors, the conditions of its life will
generally be changed in an essential manner....... If its average numbers
are to increase...... we should have to give it some advantage over a different
set of competitors or enemies." Each organic being is striving to multiply
to be vigorous, healthy, and to survive - often at the expense of members
of its own species or those of a competing species.
Chapter IV: Natural Selection;
or the Survival of the Fittest
The "fitness" of a species is modified
by several different processes. For example, sexual selection may occur
when males of a population must compete with other males to possess mates.
Those possessing some advantage -better weapons, greater energy, or more
beautiful song or plummage - are more apt to survive or attract a mate,
likely to leave the most progeny. Over time, such gradual adaptation, along
with changing conditions and outside competition, can cause "an infinite
diversity in structure, constitution, and habits, advantageous to one set
of offspring over another, or to one variety within a species over another.
"This principle of preservation, or the survival of the fittest, I have
called Natural Selection.. ."
As buds give rise by growth to fresh buds,
and these, if vigorous, branch out and overtop on all sides many a feebler
branch, so by generation I believe it has been with the great Tree of Life,
which fills with its dead n d broken branches the crust of the earth, and
covers the surface with its ever-branching and beautiful ramifications.
Chapter V: Laws of Variation
Reproductive "chance" creates variations.
When the conditions of a species alter, those individuals that survive
to reproduce may have beneficial modifications - organs or limbs that either
become stronger or more useful, or else, when not needed for survival,
weakened and diminished. This is not to say, however, that the formation
of organs serving little purpose does not occur; it most certainly does.
The human appendix may exemplify just such a process phenomenon. But any
variation within a species is, inevitably, a long, slow process.
Chapter VIII: Instinct
Habitual instincts are inherited within
each species. Ants and bees build their nests and hives with no previous
experience. Birds migrate and build homes according to their unique inner
senses. But instincts too may change over time as "consequences of one
general law leading to the advancement of all organic beings ... multiply,
vary, let the strongest live and the weakest die."
Other chapters deal with related topics:
hybridism; living species compared to those of ancient geological periods;
extinction; geographical distribution of organisms; relationships between
species; and the classification of organisms. Objections to the general
theory of evolution are presented in both Darwin's conclusion and glossary
of terms.
Darwin's observations led him to believe
that species did adapt to their changing surroundings. Furthermore, he
was led to defend as a logical, observable - and even religious - corollary
of this conclusion, a theory advancing the probability of common descent
for all living creatures.
Authors of the highest eminence seem to
be fully satisfied with the view that each species has been independently
created. To my mind it accords better with what we know of the laws impressed
on matter by the Creator, that the production and extinction of the past
and present inhabitants of the world should have been due to secondary
causes, like those determining the birth and death of an individual. When
I view all beings not as special creations, but as lineal descendants of
some few beings which have lived long before the first bed of the Cambrian
system was deposited, they seem to me to become ennobled.
The Origin of Species represents Darwin's
many years of personal and intellectual struggle. It is candidly argued
and presented in a flowing, orderly manner, then left for each reader to
weigh the evidence. As a text on natural history, its ideas are refreshingly
comprehensible and insightful.
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