''A Calculus of Angels'' is an alternate history and

fantasy novel Fantasy literature is literature set in an imaginary universe, often but not always without any locations, events, or people from the real world. Magic, the supernatural and magical creatures are common in many of these imaginary worlds. Fa ...

by American writer Gregory Keyes, the second book in '' 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 Sir Isaac Newton (25 December 1642 – 20 March 1726/27) was an English mathematician, physicist, astronomer, alchemist, theologian, and author (described in his time as a " natural philosopher"), widely recognised as one of the grea ...

discovers that

alchemy Alchemy (from Arabic: ''al-kīmiyā''; from Ancient Greek: χυμεία, ''khumeía'') is an ancient branch of natural philosophy, a philosophical and protoscientific tradition that was historically practiced in China, India, the Muslim world, ...

works, and a powerful science is built upon it.

References

External links

Sources

* "A Calculus of Angels (Book)." Publishers Weekly 246.12 (22 March 1999): 74. * Green, Roland. "Adult books: Fiction." Booklist 95.16 (15 April 1999): 1518. * Cassada, Jackie, and Barbara Hoffert. "Book Reviews: Fiction." Library Journal 124.7 (15 April 1999): 148. * Vretos, Linda A., and Trevelyn E. Jones. "Adult/Young Adult: Fiction." School Library Journal 46.1 (January 2000): 156. 1999 American novels 1999 science fiction novels 1999 fantasy novels American steampunk novels American alternate history novels Science fantasy novels Novels by J. Gregory Keyes Fiction set in 1722 Del Rey books {{1990s-ah-novel-stub