What are some metaphors in Act 1 of Julius Caesar?

Shakespeare's Julius Caesar is about the political intrigue surrounding the assassination of the Roman dictator in 44 B.C. The main characters include Caesar, his ally Marc Antony and the main plotters against Caesar, Brutus and Cassius. Shakespeare, of course, is the master of figurative language and Julius Caesar has several metaphors. Here are five examples from Act I.

In Act I, Scene 1, the tribune Marellus compares the men who have come to worship Caesar to blocks and stones, because they are as unthinking as those objects: "You blocks, you stones, you worse than senseless things". Marellus and Flavius are against Caesar because he has recently defeated Pompey, and they were supporters of that Roman leader. 

Later in Scene 1, Flavius compares Caesar to a bird who would "soar above" the masses and take away their freedoms. He says that bird must be "plucked":

These growing feathers plucked from Caesar’s wing

Will make him fly an ordinary pitch,

Who else would soar above the view of men

And keep us all in servile fearfulness.

Upon what meat doth this our Caesar feed That he is grown so great?

Which passage from act 1 of Julius Caesar includes a metaphor?

A metaphor is a comparison of two things to show the particular quality of one of those things. In Shakespeare's Julius Caesar Act I, there are a few important metaphors.

In Scene 1, the tribunes Marullus and Flavius are upset at the working men who have come out to cheer the return of Caesar. The tribunes were followers of Pompey who was defeated by Caesar. In line 36, Marullus compares the crowd to inanimate objects:

You blocks, you stones, you worse than senseless things

And later in the scene, Flavius compares Caesar to a hawk who might fly too high and keep the people in fear and servitude. He says,

Who else would soar above the view of men
And keep us all in servile fearfulness.

Upon what meat doth this our Caesar feed,
That he is grown so great?

Yond Cassius has a lean and hungry look;
He thinks too much: such men are dangerous.

"These are their reasons, they are natural," 
For I believe they are portentous things
Unto the climate that they point upon.

Poor man! I know he would not be a wolf
But that he sees the Romans are but sheep.
He were no lion were not Romans hinds.

What figure of speech is used for comparisons in Act 4, Scene 1 of Julius Caesar?

At this stage of The Tragedy of Julius Caesar the triumvirate is attempting to consolidate and organize their power in order to plan a campaign against Cassius and Brutus. They immediately begin totalk about who should live and who should die.

In this scene, Antony and Octavius are discussing Lepidus. Antony does not feel that Lepidus is worthy of an equal place in the triumvirate, so he makes several unflattering comparisons. When he says of Lepidus, “He shall but bear them [slanderous loads] as the ass bears gold,” he is comparing Lepidus to a donkey. This is a simile, because he is using the connective word “as” to make the comparison. He is trying to say that Lepidus is useful for work in the same way a donkey is.

When Octavius says that Lepidus is a “a tried and valiant soldier,” Antony counters with “So is my horse.” He’s making the point that you don’t have to be very intelligent to be a good soldier. This is similar to an implied metaphor. He didn’t come right out and say that Lepidus is a horse, but implied it. The reader gets Antony’s meaning without a direct comparison.

The bear comparison is also an implied metaphor, because they don’t actually use the word bear, saying only, “we are at the stake, And bay'd about with many enemies.” It is left up to the reader to assume that the “we” is a meant to be an animal, possibly a bear.