You blocks, you stones, you worse than senseless things! O you hard hearts, you cruel men of Rome, knew you not Pompey?
Caesar cried 'Help me, Cassius, or I sink!' / He had a fever when he was in Spain, and when the fit was on him, I did mark how he did shake
I will this night, In several hands, in at his windows throw, as if they came from several citizens, writings all tending to the great opinion that Rome holds of his name
In Act I, Scene I, Marrallus uses pathos to convince the people to go home. He explains that the people loved Pompey before he died, and that it is disrespectful for them to be celebrating his death. This appeals to the people's emotions, therefore it is pathos.
Cassius uses Logos in Act I Scene II. While he does mock Caesar for not being a suitable leader, Cassius supplies truthful information to support his opinion. He explained past experiences that would prove that Caesar is not a good leader. This appeals to Brutus' sense of logic, thus being logos.
In scene II of Act I, Cassius turns Brutus against Caesar using both Ethos and Pathos. He uses pathos by attempting to appeal to Brutus' emotions with flattery. Instead, Brutus is swayed by ethos, because he believes that joining Cassius is for the good of Rome. Cassius began by using letters and then confronted Brutus himself.