There is considerable evidence to support the proposition that spatial distances between occupational groups are closely related to their social distances. Several studies show that patterns of residential distribution by occupational stratification in a number of American cities in 1950 and 1960 are quite similar to the pattern which was initially observed for Chicago in 1950. There is some reason to believe that the generalization can be extended to include cities in other modern, urban, industrialized nations. There are those persons, on the other hand, who disagree. Theodore Caplow studied Aix-en-Provence (population approximately 27,000) about 1950 and concluded: "The familiar ecological principles which explain urban structure in the United States do not adequately account for urban structure in France…. Indeed, without the influence of uncontrolled land values, spatial distributions in France are often singularly inexpressive of social structure…. Neither the distribution of the population by social class, nor the distribution of institutions by class affiliation conforms to the fundamental spatial division of the community or to any other precise demarcation." It seems possible that this divergence of observations may be a consequence of difference in city size and classification, since studies in the United States have been limited to larger cities. Therefore, it seems worthwhile to make comparisons of residential segregation by occupation between cities which are more nearly alike in both size and function. Paris is the only city in France which approaches Chicago in size. It is true that Paris, a national capital, has more administrative activity, but it is also a raft center with extensive manufacturing, wholesale, and retail trade activity. [ABSTRACT FROM AUTHOR]