"Applied Eugenics" by Roswell H. Johnson and Paul Popenoe explores the controversial field of eugenics, advocating for the improvement of human genetic qualities through selective breeding and social policies. The authors delve into the scientific, ethical, and social implications of eugenics, presenting arguments for its application in society. They discuss various methods and practices that could be employed to enhance the human population, reflecting the prevailing attitudes of their time. The book serves as both a scientific treatise and a call to action for those interested in human genetics and societal improvement. *** The work is notable for its detailed examination of the eugenics movement, providing insights into the historical context and the motivations behind eugenic policies. Johnson and Popenoe analyze the potential benefits and risks associated with eugenics, raising questions about morality and human rights. Their perspective is shaped by the scientific understanding of genetics available at the time, making it a significant contribution to the discourse on heredity and social responsibility. "Applied Eugenics" remains a controversial text, reflecting the complexities of its subject matter and the ethical dilemmas it presents.