However important this book is to the history of women's rights, it remains a very problematic work from our more scientifically informed perspective today. In arguing for population control Sanger made frequent reference to the then fashionable "science" of eugenics. She also adopted its rhetoric, using such callous phrases as "the feeble-minded" and the "unfit" and advocating birth control as a means of limiting the breeding of "defectives, delinquents and dependents." Although she incorporated views and terminology commonly held in respectable medical and scientific circles of the day, Sanger's writings on eugenics, and this book in particular, have become fodder for her critics both on the left and the right, who seek to diminish her achievements and obscure what is ultimately a powerful feminist message: when women gain greater control over their fertility, they will improve the human race. This unusual and historically significant book is complemented by a thoughtful and informative introduction by Peter C. Engelman, assistant editor of The Margaret Sanger Papers Project, who provides much insight by placing this work in the context of the age and Sanger's life.