In ''White Egrets'', Derek Walcott treats his characteristic subjects - the Caribbean's complex colonial legacy, the Western artistic tradition, the blessings and withholdings of old Europe (Andalucia, the Mezzogiorno, Amsterdam), the unaccomodating sublime of the new world, time's cunning passages, the poet's place in all of this - with a passionate intensity and drive that recall his greatest work. Through the systolic and mesmerizing repetition of theme and imagery, Walcott carries his surf-like cadence from poem to poem, and from sequence to sequence in this celebratory and close-knit collection.