We heard much a few years ago in England of the evils of immigration into the British Isles of aliens, whom the Board of Trade returns show amount to eight thousand per annum--a figure which appears paltry when compared with the forty thousand people who leave Ireland every year. It is a cry which one is told should make the thirty-seven million inhabitants of England and Scotland burn with indignation that this number of foreigners land on their shores every year. Surely we Irishmen have a far greater cause of complaint in the fact that out of a population of four and a half millions, less than is that of London, a number greater than those of a town of the size of Limerick emigrate every year. Most of these emigrants are in the prime of life. Their average age is from twenty to twenty-five, and more than ninety per cent. are between the ages of ten and forty-five years. Here is the crucial fact, that it is the young, the active, and the plucky who are being tempted by promises of success abroad, to which they see no likelihood of attaining at home, and in this way is established a system of the survival of the unfittest, an artificial selection of the most malignant kind, which is leaving the old, the infirm, the poor, and the unadventurous behind to swell the figures of pauperism and to propagate the race. All the authorities are agreed in attributing to this cause the lamentable increase of lunacy, which is one of the most terrible factors in the economy of modern Ireland. The last Census report shows the total number of lunatics and idiots to have been in 1851 equal to a ratio of 1 in 637 of the population, and to be in 1901 equal to a ratio of 1 in 178. The proportion is, as one would expect, highest in the purely agricultural districts and lowest in the neighbourhood of cities, such as Dublin and Belfast, where industrial conditions imply better wages and food, and a less monotonous existence. It should be remembered that the proportion of imbeciles in Great Britain has risen in the period of fifty years as it has in Ireland--partly, no doubt, owing to a better system of registration of lunacy--but, at the same time, the fact remains that the average in Ireland is very much greater than in England and Wales, rising in some Irish counties to a proportion twice, and in another to a ratio thrice, as high as that of the average of the whole of England and Wales.