It will not be difficult to show that the Irish have come to this country since 1790 in much greater numbers than available records, statistics, or estimates show, and that their descendants are much more numerous than many suppose them to be. The same might be said of the Irish who arrived here before the period just referred to, and particularly before the Revolution—a fact to which I briefly called attention in a little work written several years ago. In this paper, however, consideration will be confined to the Irish who arrived here since 1790 and their descendants. Until September, 1819, there was no supervision of immigration by the national government, and no records were kept by federal officers of the arrival of immigrants. For the numbers, therefore, of those who came here from 1790 to 1820 we are practically left without official or positive information, and the statements or conjectures of the writers who have dealt with this subject not only betray their imperfect knowledge, but show that they failed to take into consideration some weighty facts essential to the formation of correct estimates. Thomas Cooper, an Englishman who visited this country in 1794, tells us that “emigration of all kinds from Europe to the United States amounted at that time to about 10,000 a year.” Samuel Blodgett, Jr., however, writing in 1810, assumed that the number of immigrants did not average more than 4,000 a year for the previous ten years, but he gave a table of the population, in one column of which the number of “freemen and slaves” who entered the United States in 1804 was put down at 9,500. Blodgett says that he relies on “the best records and estimates at present attainable,” but he fails to tell us where those records were to be found, or by whom they were kept. A. Seybert, an ex-member of congress, who wrote in 1818, says that the statements in Blodgett’s work “are deficient in details; they consist chiefly of general results and the estimates of the author. Though many of his tables are ingeniously constructed, they do not furnish sufficient data for legislators.” Seybert, while admitting the correctness of Cooper’s estimate of 10,000 arrivals during the year 1794, differs from him with regard to the immigration for the following years up to 1817, and assumes that 6,000 persons only, on the average, arrived here annually from 1790 to 1810. He, however, furnishes us with a statement of the number of passengers who arrived at ten of the principal ports of the United States in 1817, which shows the entrance in that year of 22,240 immigrants, of whom 11,977 came from Britain and Ireland; 4,169 from Germany; 1,245 from France, and 2,901 from British America.