Scholars and fans of the great mythologist will find a rich vein of information in Humphrey Carpenter's The Letters of J.R.R. Tolkien. Tolkien was a prodigious letter writer all his life; the sheer mass of his correspondence would give pause to eventhe most stalwart archivist (one shudders to think what he would have done with e-mail). But with the able assistance of Tolkien's son Christopher and a healthy dose of determination, Carpenter manages find the cream of the crop--the letters that shed light on Tolkien's thoughts about his academic and literary work, as well as those that show his more private side, revealing a loving husband, a playful friend, and a doting father. The most fascinating letters are, of course, those in which he discusses Middle-Earth, and Carpenter offers plenty of those to choose from. Tolkien discussed the minutia of his legend--sometimes at great length--with friends, publishers, and even fans who wrote to him with questions. These letters offer significant insights into how he went about creating the peoples and languages of Middle-Earth.I have long ceased to invent (though even patronizing or sneering critics on the side praise my 'inventions'): I wait till I seem to know what really happened. Or till it writes itself. Thus, though I knew for years that Frodo would run into a tree-adventure somewhere far down the Great River, I had no recollection of inventing Ents. I came at last to the point, and wrote the 'Treebeard' chapter without anyrecollection of any previous thought: just as it is now. And then I saw that, of course, it had not happened to Frodo at all.