"Eugenics as a Factor in the Prevention of Mental Disease" by Horatio M. Pollock is a scientific publication written in the early 20th century. The book explores the concept of eugenics and its potential application in preventing mental diseases, addressing the rising societal burden of mental health issues during that era. In this work, Pollock discusses the increasing prevalence of mental disease, presenting alarming statistics on the growth of patients needing care in state hospitals. He emphasizes the importance of understanding hereditary factors related to mental health while advocating for proactive measures to mitigate mental disease. Citing environmental influences, he suggests a multi-faceted approach, including improving public mental hygiene, regulating procreation among individuals with mental deficiencies, and promoting better family stock through informed marriage practices. The book serves as both a statistical reflection on mental health issues of the time and an appeal for societal change through eugenics to alleviate the mental health crisis. (This is an automatically generated summary.)