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Personification
Explanation and Analysis—Nature Personified:

In Chapter 4, Darwin comments on the way he personifies "Nature" in his writing, using logos to defend his choice:

It has been said that I speak of natural selection as an active power or Deity; but who objects to an author speaking of the attraction of gravity as ruling the movements of the planets? Every one knows what is meant and is implied by such metaphorical expressions; and they are almost necessary for brevity. So again it is difficult to avoid personifying the word Nature; but I mean by Nature, only the aggregate action and product of many natural laws, and by laws the sequence of events as ascertained by us.

Darwin is addressing complaints that he is treating natural selection as though it is some new force that supplants God as the creator of the universe. He admits that he writes about it as if it has the kind of volition and power God has. However, he draws a distinction between literal and figurative language. He does not literally mean that Nature is God-like. Rather, he writes, he personifies it so that he can speak about the "aggregate and product of many natural laws" under the umbrella of his unified theory about the way life has evolved on earth. To defend his choice to use this figurative language, he reminds readers that other scientific writers personify forces of nature all the time. For instance, it is common to read that gravity "rules" planetary movements. By invoking this norm within scientific writing, Darwin aims to convince his readers not to read too much into his own personification of nature.

While Darwin's logic holds true here, it is also important to note that his personification often serves to dramatize nature and the process of natural selection. He frequently describes nature using comparisons to human dynamics and institutions. For example, he refers to the "physiological division of labor," a metaphor many scientists used at this time. By invoking one of the core principles of capitalism, this concept aims to explain how different tissues in an organism take care of different functions the organism needs to stay alive. Humans invented capitalism long after complex life forms emerged on earth, so it is somewhat odd to describe biological functions in terms of capitalism. Darwin's frequent use of personification and other figurative language invoking human society helps him persuade readers who are compelled by stories of human conflict and triumph. Furthermore, it makes for a good narrative.

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    Romeo
    (to himself) She speaks. Speak again, bright angel! For tonight you are as glorious, there up above me, as a winged messenger of heaven who makes mortals fall onto their backs to gaze up with awestruck eyes as he strides across the lazy clouds and sails through the air.
    Juliet
    O Romeo, Romeo! Why must you be Romeo? Deny your father and give up your name. Or, if you won’t change your name, just swear your love to me and I’ll give up being a Capulet.
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