"Holmes is not offering a history of either or its technologies. The and are barely mentioned (perhaps because they feature in The Age of Wonder). What we have instead is a "cluster of balloon stories" drawn from life and fiction, and more from life than from fiction. Some of the footnotes are anecdotal, but the book itself is more than that; Holmes is a distinguished with a fine sense of how individual lives reflect and redirect the larger forces that flow through and around them."