<span>As Mr. Utterson’s character develops, he becomes more worried.
You can see in the first excerpt that he is really enthusiastic about his work and that he wants to find out who the criminal is. However, over the course of the following two excerpts, you can see that he is growing more and more worried about not finding the criminal yet. Phrases such as "under a weight of consideration," and "sobre spirits" tell you a lot about him worrying.
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The earth is rather large and not exactly a point in space, the author however is comparing it to a point in space because of how vast space really is. A metaphor is basically a comparison (Not exactly true) that doesn't use the words like or as... (That's a Simile.) The earth isn't an actual dot in space. It's big, but because of how big space is, it's compared to a dot... Hope this helps... :)