This is an excellent source for learning about the development of the symphony orchestra from its genesis through the modern era. The book is presented chronologically, but Carse identifies different periods by the prominent composers/orchestrators of the day instead of using the normal lines of demarcation (Renaissance, Baroque, etc.). He gives equal time to discussions of the development of the entire ensemble, the development of the individual instruments (especially brass and woodwind), and the common vs. revolutionary practices in orchestration of each particular period, as well as describing the regional differences in orchestration throughout the book (i.e. German vs. French vs. Italian vs. British).I would make two recommendations when reading this book: 1) don't read it before going to bed! It is written in a very dry manner that makes it difficult to completely comprehend under drowsy conditions (those of you who had to study the Grout know what I'm talking about!), and 2) take the time to study scores and recordings along with the discussion; while there are several printed musical examples given, they are extremely concise and do not add much to the point. A thorough score analysis along with listening study of the works and/or composers being discussed will make the material come to life!Keep in mind that this book was originally published in 1925; when discussing the 19th century he refers to it as "last century" and you will find you have to constantly remind yourself what century he's referring to. Also, the book stops at about 1900, so it does not discuss any of the important works of the 20th century (i.e. Le Sacre du Printemps, The Planets, Bolero, etc.).Overall, this is a very informative text.