That's interesting. Two thing about that:
What does Black's Law (assuming that's what the scan is from) say about "revenue"?"Income" when applied to the affairs of individuals expresses the same idea that "revenue" does when applied to the affairs of a state or nation.
Below it, 'income tax' is defined as tax on yearly "profits", which in 'Income' is defined as gain upon businesses and investments.
Am I being too pedantic, or is this one of the reasons we're (meant as those who are non-sheep) fighting the way we are?