This book studies Turkish eugenics. Eugenics is the touchstone of racism. It is impossible to believe in that racist ideas of the West could not or did not find any proponents in Turkey. Any politician who aims to reach power may use the necessary terminology, the catchwords. Whether this man and his brethren would reach political power is some other issue and depends on various parameters. It is better to seek answers to the question "What happened?" instead of "What was said?" Therefore, in this work, great attention has been paid to avoid deductions bounded by "catchwords" and to definitions that were often utilised in the historiography of the 1930's.