THE SOUL'S CODE
By James Hillman
334 pages, Random House, $23.00 ***** IN HIS LATEST book, prolific psychologist James Hillman chooses as his thesis "great oaks from little acorns grow." The question he explores in "The Soul's Code" is how the acorn becomes the oak, and why so many acorns fall short of their potential. While the issue is intriguing and Hillman's technique is often engrossing, his analysis is ultimately unsatisfying. Hillman's acorn theory isn't as simple as it may sound. To put it, as his first chapter says, in a nutshell, t"each person bears a uniqueness that asks to be lived and that is already present before it can be lived." The major …