There are introverts among them and extroverts and mesoverts and ambiverts and other verts, if there be such. And therefore they react differently. But (and this is the important point) the different types are not distributed in the same proportion as in the majority groups. The Jews have more introverts and extroverts and fewer mesoverts and ambiverts than non-Jews, not because of peculiar innate traits, but solely, I believe, because of the unfavorable environmental conditions ...
