Additions to the 10th edition of Linnaeus' Systema naturae create a foundation for "scientific racism."
Date: 1758
Linnaeus adds moral judgments about personality and health based on medieval understandings of the body's "humors" to his racialized classification system for human biology. White is associated with "sanguine," Black with phlegmatic, "yellow" with "melancholic," and "red" with "choleric."