I used to work in a university health sciences library that had thousands of different journals, some dating back to the 1800s. There were some Eugenics journals that discuss this stuff hidden in a medical paper format and jargon. All of these promptly went out of print around 1944, '45. But it really was in the medical mainstream for some time.
Arthur Jensen just came out with this really thick heavy book that supposedly 'scientifically' demonstrated the superiority of whites and japanese people over everyone else. I flipped through it but didn't read the whole thing. He says that there is the existence of a 'g factor' that is a definable and measurable factor equal to IQ, and he came to the conclusion that there is no difference between men and women on average, but that sub-saharan Africans have an average IQ of 70. It goes on and on with this crap, and he includes all the irrelevant details of his regression analyses etc. as though that will make it more legitimate, but his overall results agree with the Bell curve, that the demographic groups in the world that are the wealthiest right now, also are the most intelligent. He showed samples of 'nonverbal' questions that were given on his tests and it would just be recognizing a pattern or guessing the next shape in a sequence... and it's just total bullshit. It's not particularly surprising that if you give paper pencil tests to some people in Nigeria who haven't gone to western schools and don't require this type of spatial reasoning, that they won't do as well as people in western countries who have been taught this sort of thing since kindergarten. Women are equally distributed among all classes, so logically, the class bias wouldn't show up here. He gets into political advocacy like Charles Murray too (Did anyone see the painfully stupid libertarian book that Murray came out with about a year ago? .... oh my god. It was printed on fake aged paper, and they were promoting it as being similar to revolutionary war era political tracts by Patrick Henry. And he just droned on like Ayn Rand about how the truly great and smart people would just have to seize the system away from the leaches and dare to live up to the original ideals of the country.) CP