The Evolution of Calpurnia Tate, by Jacqueline Kelly, is a young adult novel which follows the self-education and adventures of Calpurnia "Callie" Virginia Tate, a young girl living on a pecan planation outside Fentress, Texas, who resists the traditional feminine duties placed on her in favor of more interesting scientific pursuits. After theorizing about the differences in grasshopper species on the lawn outside her house, Callie works up the courage to ask her aloof Granddaddy to borrow a copy of Charles Darwin's The Origin of Species. Impressed by her intellectual curiosity and knowing that the world is at the turning point of modernity with the 20th century rapidly approaching, Granddaddy takes Callie under his wing and helps educate her about the natural and scientific world.
So, to answer your question, the book is told through the voice of Callie in a first person point of view. Callie is spunky, smart, curious, and independent; her voice provides a fascinating insight into being a girl at the turn of the century and depicts an interesting narrative perspective of self-discovery.