Thus, whether Customs and Excise are handed over to the Irish Parliament or retained by the Imperial Parliament, the consequences are equally embarrassing. In the one case Ireland would be deprived of the control of some 60 per cent. of her present revenue, and of all power of expansion; in the other, British trade with Ireland might be gravely injured by hostile legislation, and the union of the three kingdoms in financial and commercial policy would be destroyed. But this is not federation, nor is it a step towards it. It is separation pure and simple. Unless we are prepared to accept separation as the end of our policy the control of Customs and therefore of Excise, must remain an Imperial affair. There can, therefore, be no justification for taking the control of the Customs and Excise from the Imperial Parliament. The Irish Parliament would thus be left with some 40 per cent. of present revenue under her own control. But the power to raise further revenue within the limits legally reserved to the Irish Parliament would be even less than this figure would imply. For of the L4,100,000 of revenue other than Customs and Excise, nearly L1,200,000 comes from the Postal Services; and even if these services were controlled by Ireland, it may be taken that the rates charged will be the same as in Great Britain. Of the remaining L2,900,000 nearly one-half comes from income tax. It has already been pointed out that its yield cannot be materially increased. There are only two ways by which an Irish Chancellor might attempt such a task. He might raise the rate of income tax or he might lower the exemption limit. The former course would almost certainly be followed by two equally undesirable results. So far as the tax continued to be paid in Ireland it would fall with crushing force on the already heavily-burdened agricultural industry. Still, from the point of view of the Exchequer, there might be some additional revenue on this account. On the other hand, there would be a check to the investment of capital in Ireland--and no country needs capital more--and a powerful temptation to transfer it where the tax would be lower. It may be seriously questioned, therefore, whether any increase in the income tax above the British rate is practicable. The other alternative, namely, the lowering of the exemption limit, would be so unpopular that no Irish Chancellor is ever likely to consider it seriously.