The book "Eugenics of married life, volume 4 (of 4): a personal guide to the new science of a better life and better children" by the author V. Grant Hague (William Grant Hague) is a valuable source of knowledge about eugenics - the science of improving the gene pool of mankind. In this expanded volume, the author examines in detail the issues of family planning, creating healthy genetic lines, and provides advice on improving the quality of life for individuals. With each page, the reader gets an opportunity to deepen his knowledge and understanding of how modern science can contribute to the creation of a happy and healthy society. The book is an important source of information for anyone interested in genetics, eugenics, and improving the quality of our common existence.