The vast numbers, especially of the Russian Jews and Austro-Hungarians, herded in masses in certain of our great cities, have given us a kind of social indigestion; it must be cured, if at all, by a slow process of absorption, and we have not yet learned just what to do about it. Certainly unintelligent excitement, to say nothing of unlawful violence and mob persecution, and the exaggeration both of the degree and of the nature of the ailment, offer small promise of betterment. Nature, the normal processes of population movements and racial assimilation, work calmly on while we shout and worry. And candid study of the process is reassuring. Conditions have been confused, resentments aroused, and progress retarded by the various kinds of hysteria excited by the World War--but then, there was similar hysteria in the old Know-Nothing days, and we lived through it; it seems rather silly now. We shall live through this. PAUCITY OF DEPENDABLE INFORMATION Meanwhile we may try to know and understand the facts. This is not so easy as might be supposed, for the facts are hard to get. The student of the naturalization and political assimilation of the foreign-born citizen finds himself seriously embarrassed by the paucity of definite information on the subject in any of its aspects. To be sure, there is a considerable, though somewhat fragmentary, literature about it, and generalizations of a sweeping and rather dogmatic character have gained wide currency--impressions and prejudices, which it will no doubt be difficult to dislodge, even though such information as may be available, critically examined, entirely fails to support them. In hardly any other field may one find a better illustration of the mischief that may be wrought by inadequate or misinterpreted statistics, creating legends which cannot endure the test of candid, to say nothing of scientific, examination. This is not to say that there is no material on the subject. There is always the census; there are the reports of the Immigration Commission of 1907; there are the reports of the Commissioner of Naturalization. There are numerous books, essays and pamphlets, by men and women who, to a greater or lesser extent, have come to be regarded as experts on the subject of immigration. But, as we shall see, these are almost all entitled to substantial discount, or at least discriminating study, with results conducive to a better understanding, to a readjustment of some ideas which, although mistaken, have come to be regarded as fundamental.