The philosophy of perception is certainly not Ryle’s main preoccupation, though he turns his attention to it on several occasions. His most extensive treatment of perception can be found in "The Concept of Mind", where he dedicates a whole chapter to the topic. Some of the ideas are fleshed out and elaborated later in "Dilemmas" and in the article ‘Sensation’. Among the recurring subjects is the difference between perception and sensation, the critique of sense-data and the grammar of perception verbs such as ‘see’, ‘hear’, ‘observe’ etc. However, the reception of these writings is neither extensive nor well-disposed. Most commentators concentrate on the negative and critical parts of Ryle’s discussion of perception, and on his dismissal of...