A "grown-up" parliament needed "grown-up powers", the Scottish National Party leader, Mr Alex Salmond, said yesterday as the battle over the proposed Scottish parliament's power to vary tax dominated the final stages of the referendum campaign.Mr Salmond, whose party has joined forces with Labour and the Liberal Democrats, predicted a massive "Yes, Yes" vote in tomorrow's poll, which would give Scotland its first parliament in 300 years.Scots will be asked to vote separately for the creation of a parliament, and for it to have the power to vary tax rates by up to 3p.Speaking at a Glasgow press conference, Mr Salmond said: "The Tory "No, No" front is running on an entirely negative agenda, and has comprehensively lost all the arguments."They refuse to trust the people of Scotland and the people have no confidence in the Tories or their anti-Scottish stance."Tory scares, said Mr Salmond, had "failed to convince Scots of their negative and doom-laden case".He went on: "The reality is that of the 10 richest countries in the industrialised world, seven contain devolved parliaments with revenue powers. And the other three are small, independent nations - with full control over tax and spending."He said that in Switzerland, which was 30 per cent richer than the UK, and the third wealthiest country in the world, the 26 self-governing cantons actually had greater tax-varying powers than central government.Mr Salmond asserted: "Scots will take no lessons on tax from the Tories, because they are the people who brought Scotland the disastrous poll tax experiment, which cost £1,000 million to set up and then abolish - enough money to run the Scottish parliament for half a century."The "No, No" Tories, said Mr Salmond, "represent Scotland's undemocratic and unfulfilled past. It is the "Yes, Yes" campaign which stands for Scotland's confident hopes of a more successful and compassionate future . . . "A Scottish parliament with grown-up powers, focusing on the specific circumstances of the Scottish ceremony, will get more things right across the spectrum of its responsibilities than could ever be the case under Westminster," said Mr Salmond.