As a warning to others, his body has been left on a gibbet, just outside the town. It'll hang there till it rots or it's stolen.
10 seconds sound clip from the The Curse of Frankenstein movie soundboard.
You can hear this line at 00:15:53.342 in the Blu-ray version of the movie.
Quote context
[...]
- We hold in the palms of our hands such secrets that have never been dreamed of.
- First we need the framework, the body.
- The birds didn't waste much time, did they? The eyes... Half the head is eaten away.
- Take the head off. It's no use to me anyway.
- It's in the acid. A few minutes, and there'll be no trace.
- Paul, give me a hand with his clothes, will you?
[...]