cacogenics

n.

劣生学（研究杂交造成的种系退化现象等）；

The nam family : a study in cacogenics
EUGENICS vs. CACOGENICS: An Ethical Question of Importance to the Movement—Attention Should Be Centered on Factors of Absolute Valu...
The Nam family; a study in cacogenics, by Arthur H. Estabrook ... and Charles B. Davenport ... With four charts and four text figures.
Human Inheritance
Eugenic Sterilization in the United States
Modernist Versions of Pastoral: Poetic Inspiration, Scientific Expertise, and the “Degenerate” Farmer
Dysgenics
Dysgenics
Dysgenics
Dysgenics