"Sheeny," "Dago," "Wop," "Kike," "Greaser," "Guinea," etc., testify to the feeling of the older population that it is superior. While eugenic strength in a state is promoted by variety, too great a heterogeneity offers serious social difficulties. It is essential if America is to be strong eugenically that it slow down the flood of immigrants who are not easily assimilable. At present a state of affairs is being created where class distinctions are likely to be barriers to the promotion of individual worth--and equally, of course, to the demotion of individual worthlessness. Even if an immigration is not assimilated, then, it yet has an indirect effect on eugenics. But there are other indirect effects of immigration, which are quite independent of assimilation: they inhere in the mere bulk and economic character of the immigration. The arrivals of the past few decades have been nearly all unskilled laborers. Professor Carver believes that continuous immigration which enters the ranks of labor in larger proportion and the business and professional classes in a smaller proportion than the native-born will produce the following results: 1. Distribution. It will keep competition more intense among laborers and less intense among business and professional men: it will therefore raise the income of the employing classes and lower the wages of unskilled labor. 2. Production. It will give a relatively low marginal productivity to a typical immigrant and make him a relatively unimportant factor in the production of wealth. 3. Organization of industry. Immigrants can only be employed economically at low wages and in large gangs, because of (2). 4. Agriculture. If large numbers of immigrants should go into agriculture, it will mean one of two things, probably the second: (a) Continuous subdivision of farms resulting in inefficient and wasteful application of labor and smaller crops per man, although probably larger crops per acre. (b) Development of a class of landed proprietors on the one hand and a landless agricultural proletariat on the other. It is true that the great mass of unskilled labor which has come to the United States in the last few decades has made possible the development of many industries that have furnished an increased number of good jobs to men of intelligence, but many who have made a close study of the immigration problem think that despite this, unskilled labor has been coming in altogether too large quantities. Professor Ross publishes the following illustration: "What a college man saw in a copper-mine in the Southwest gives in a nutshell the logic of low wages.