Hecate’s: A roman sculpture.

Gouts:A drop or spot of something.

prate:talk foolishly or at tedious length about something.

It is on act 2 scene 1

What happens in the soliloquy is that Macbeth has a vision about a bloody dagger ,he tries to touch it but it is not palpable but it looks really real but then realises it is a illusion.