Scottish people "do not expect to be shouted down" and want to debate freely, the leader of the Better Together campaign told Good Morning Britain.
While Alistair Darling acknowledge it was only a small minority of Yes campaigners who had intimidated voters, he said it is "not the sort of Scotland any of us want to live in."
One story dominates Thursday's front pages with some newspapers printing emotive pleas to voters to keep the United Kingdom as one.
In Edinburgh tonight you can hear it and feel it. The buzz, the banter of the day and the thrilling sense something big is coming tomorrow.
There is nervousness, anxiety and on the streets of Edinburgh fuelled by an atmosphere unlike anything seen before in recent UK politics.