Somerville (philosophy, U. of Hull) argues that the occurrence of interrogative clauses after know (such as to know what . . . and to know whether . . . ) shows that knowledge in particular and thought in general can be interrogative in form. He fleshes out his position with discussions of the interrogative, questions and enquiry, asking questions, stating answers, interrogation, requesting, interrogative form, and logic and different types of question. Annotation c. Book News, Inc., Portland, OR (booknews.com)