"Although the past years have seen the publication of monographs on almost every aspect of Thomas Reid''s philosophy, his theory of primary and secondary qualities has not been treated in book length. Christopher Shrock closes this gap in the literature ... It is easily the most comprehensive treatment of Thomas Reid''s theory of primary and secondary qualities currently available. The offered interpretation of Reid''s view is convincing and, in my opinion, superior to those of Shrock''s predecessors ... The book is intended as a historically adequate study of Reid''s views on secondary qualities, but it also follows a genuinely systematic interest. I found the blend of these two tenets very convincing and a pleasure to read ... I wholeheartedly recommend it to every scholar interested in secondary qualities in the eighteenth century or Thomas Reid''s theory of perception." --Hannes Ole Matthiessen, Humboldt-Universitat zu Berlin, Journal of Scottish Philosophy