Paul John (whisky) evaporation during aging, known as the angels' share, is also higher in India, at 10–12% per year, than in Scotland, where the annual evaporative loss is about 2%. This leaves a hogshead with only 150 bottles left in it, after three years, compared to around 350 in a Scotland. Michael John describes it this way, "Whisky matured at these temperatures simply cannot be aged for the kind of time expected with Scotch, even trying to mature our whisky for just 10 years would leave barely a bottle of liquid in the barrel. Fortunately, the heat actually speeds up the maturation
Scotch whisky their courts, so forcing the maximum penalties to be applied, with some cases removed to the Court of Exchequer in Edinburgh for tougher sentences. Highland landowners were now happy to remove tenants who were distillers in clearances on their estates. These changes ushered in the modern era of Scotch production: in 1823 2,232,000 gallons of whisky had duty paid on it; in 1824 this increased to 4,350,000 gallons. Two events helped to increase whisky's popularity: first, the introduction in 1831 of the column still; the whisky produced with this process was generally less expensive to produce and also less intense