Guy Sircello\'s analysis of the varieties of expression and his use of them to justify a particular view of the human mind clarify a number of controversial topics in contemporary philosophy, among them the notion of \"artistic acts,\" language as expression, the expression of ideas, expressions as \"natural signs,\" and the nature of the causal relationship between an expression and what is expressed. Originally published in 1972. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.