feeblemindedness. During this time period members of the Society such as Julian Huxley expressed support for eutelegenesis, a eugenic proposal to artificially inseminate women with the sperm of men deemed mentally and physically superior in an effort to better the race. 1942 to 1989 The Eugenics Society underwent a hiatus during the Second World War and did not reconvene until 1942, under the leadership of General Secretary Carlos Blacker. In the postwar period, the Society shifted its focus from class differences to marriage, fertility, and the changing racial makeup of the UK. In 1944, R. C. Wofinden published an article in the Eugenics Review describing the features of "mentally deficient" working-class families and questioning whether mental deficiency led to poverty or vice versa. Blacker argued that poor heredity was the cause of poverty, but other members of the Society, such as Hilda Lewis, disagreed with this view. Following WWII, British eugenicists concerned by rising divorce rates and falling birth rates attempted to promote marriages between "desirable" individuals while preventing marriages between those deemed eugenically unfit. The British Social Hygiene Council, a group with ties to the Eugenics Society, formed the Marriage Guidance Council, an organization that offered pre-marital counseling to young couples.In 1954, the Eugenics Society was referred to by the North Kensington Marriage Welfare Centre's pamphlet "Eugenic Guidance," as a source for consultation for couples worried about passing on their "weaknesses." As a result of the British Nationality Act of 1948, which enabled Commonwealth citizens to immigrate to the UK, postwar Britain saw an influx of non-white populations. The Eugenics Society became concerned with changes to the racial makeup of the country, exemplified by its publication of G. C. L. Bertram's 1958 broadsheet on immigration from the West Indies. Bertram claimed that races were biologically distinct due to their evolved adaptations to different environments, and that miscegenation should only be permitted between similar races. In 1952, Blacker stepped down as Secretary of the Eugenics Society to become the administrative chairman of the International Planned Parenthood Federation, or IPPF. The IPPF was sponsored in part by the Eugenics Society and headquartered within the Society's offices in London. Blacker's influence continued in 1962, when he published an article in the Eugenics Review defending voluntary sterilization as humanitarian effort beneficial to mothers and their existing children. The last volume of the Eugenics Review was published in 1968. It was succeeded by the