In the tenth edition of Systema Naturae he further detailed phenotypical characteristics for each variety, based on the concept of the four temperaments from classical antiquity, and changed the description of Asians' skin tone to "luridus" (yellow).
Na décima edición de Systema Naturae detallou as características estereotipadas de cada variedade, baseándose no concepto dos catro temperamentos da antigüidade clásica, e cambiou a descrición do ton de pel dos asiáticos a "luridus" (amarelos).