In the introduction to the book, John Freeman tells the story of how Jung came to get involved with the project. Apparently, the managing director of Aldus books had seen Jung on the BBC and was so struck by his warmth and personableness that he tried to persuade Jung to apply those same qualities to a book written for the general masses, rather than for psychologists themselves. While at first refusing, Jung was swayed by one of his own dreams into changing his mind and agreeing to take on the project. Given that the book to a large degree dwells on dreams and what can be learned from them, it is an appropriate anecdote.
The publisher does not get any praise for designing the cover in such a way that it implies Jung was the author of the entire book. He was the editor and wrote one of the chapters. Neither is the book an integral whole-- the chapters treat different aspects of symbolism and the unconscious, each with their own viewpoint and flavor.
The essays in the book are as follows:
"Approaching the Unconscious" (Carl Jung)-- for those who don't know his work, this is a very nice introduction to most of the basic points.
"Ancient Myths and Modern Man" (Joseph L. Henderson)-- examines symbols as they appear in both myth and modern day culture.
"The Process of Individuation" (M.-L. von Franz)-- treats patterns of dreams over the lifetime of the individual. A good look at the concept of Animus and Anima.
"Symbolism in the Visual Arts" (Aniele Jaffe)-- IMO the weakest chapter, looks at the progression of sacred symbol to art.
"Symbols in an Individual Analysis" (Jolande Jacobi)-- Describes the treatment through dream analysis of a young Swiss man.
While the book felt uneven in places (and even contradictory), it serves well in the purpose for which it was intended. Someone reading the book will get the basic concepts of symbols and the unconscious, and some decent pointers to further readings in the notes if they wanted to find out more.