Everything is going to be nice and quiet and respectable.

The effect of the poison is similar to heart failure.

No one can tell the difference on the corpse.

There's going to be no blood anywhere.

I will be found dead in my house in the morning with heart failure, or else he will be picked up dead in the street, far enough away so as to make no talk." Or they was words to that effect.
He is rubbing it in considerable, I thinks, that perfessor is.