A Calculus of Angels
|Cover artist||Therese Nielsen|
|Series||The Age of Unreason|
|March 30, 1999|
|Media type||Print (Paperback)|
|LC Class||PS3561.E79 C35 1999|
|Preceded by||Newton's Cannon|
|Followed by||Empire of Unreason|
A Calculus of Angels is the second book in Gregory Keyes' The Age of Unreason series. It was initially published by Del Rey on March 30, 1999. A follow up to Newton's Cannon, the book is set in 1722 and continues the alternate history where Isaac Newton discovers that alchemy works, and a powerful science is built upon it.
- "A CALCULUS OF ANGELS (Book)." Publishers Weekly 246.12 (22 Mar. 1999): 74.
- Green, Roland. "Adult books: Fiction." Booklist 95.16 (15 Apr. 1999): 1518.
- Cassada, Jackie, and Barbara Hoffert.. "Book Reviews: Fiction." Library Journal 124.7 (15 Apr. 1999): 148.
- Vretos, Linda A., and Trevelyn E. Jones.. "Adult/Young Adult: Fiction." School Library Journal 46.1 (Jan. 2000): 156.
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