Brownecho,
Not sure what happened to your post showing a pic of Fatal Invention but I'll respond anyway. Interesting looking book. I've not read or heard of it but I will say the title makes sense as extension of 19th century progressivism and race eugenics. This thinking was popular among wealthy Anglo Americans but also social progressives of wealth and means. I don't think it died but rather got hidden in plain site behind other names in the 20th century.
These systems and ideas are the means on which the masses are kept at bay to protect the sons of fortune.