Richard C. Trexler. Public Life in Renaissance Florence. (Studies in Social Discontinuity.) New York: Academic Press. 1980. Pp. xxvi, 591. $45.00 and Samuel Kline Cohn, Jr. The Laboring Classes in Renaissance Florence. (Studies in Social Discontinuity.) New York: Academic Press. 1980. Pp. xii, 296. $29.50