Book Reviews : From Encroachment to Involvement, A Documentary Study of Soviet Policy in the Middle East, 1145-1973. Edited by YAACOV RO'I. (New York : Halstead Press. 1975. Pp. 592. $26.75.)

while the impact of early socialization may be overstated with regard to developing loyalties to the political system, it may be critical with respect to the inculcation of procedural modes for political participation. Cornelius’ contrast between rather fluid loyalties and rigid patron-client behavioral modes might indicate that the former should be viewed as contextually sensitive and the latter as more firmly rooted in both rural village life and the rural family structure. With regard to the implications of Cornelius’ findings for the future of the Mexican political system, his studv suggests that the urban migrant poor in Mexico City have. to this point served as a base of political support for the PRI. This