In his new book, The Shallows, Nicholas Carr has written a Silent Spring for the literary mind. He begins with a feeling shared by many who have spent the last decade online. "I'm not thinking the way I used to think," Carr tells us. "I feel it most strongly when I'm reading." He relates how he gets fidgety with a long text. Like others, he suspects that the Internet has destroyed his ability to read deeply. "My brain," he writes, "wasn't just drifting. It was hungry. It was demanding to be fed the way the Net fed it."