Mentions

LEONARDO THE FLORENTINE--A Study in Personality--Rachel Annand Taylor-- Harpers ($6.00). Rich dignity in a biography of da Vinci, the central figure in a luminous tapestry of Italian Renaissance. A CENTURY OF FASHION--Jean Philippe Worth--Little, Brown ($7.50). Three generations of dressmakers dictate to society dowagers, famous actresses, and ladies of the evening. THE TWILIGHT OF THE AMERICAN MIND--Walter B. Pitkin--Simon & Schuster ($3.50). Provocative, logical, but curiously perverted warning against too much education, too thorough eugenics. *A managing editor of the Herald was asked if his office had any list of ''sacred cows." He replied: ''How in hell can I be expected to carry the names of all the members of the Union Club in my mind." *His father died at the same age.