The statement that cancer education is not true if conducted correctly is challenged, as many so-called neurotics seek reassurance that they do not have cancer. Cancer education is widespread, especially in the US, but methods vary by country. In Britain, local authorities are legally required to provide health education, and it is hoped that cancer education will be included to improve early diagnosis and reduce mortality. A pilot scheme in a large area could test different methods over one or two years. The Galton Lecture by Professor Sewall Wright discussed the genetical structure of populations. He noted that Mendel's genetic approach and Galton's statistical approach are complementary. In a randomly breeding population, gene frequencies remain stable, while in blending heredity, variability halves each generation. This principle was first described by Hardy and Weinberg in 1908. Wright also discussed how population structure affects genetic properties, and how changes in zygotic composition can alter these properties even without changes in gene frequencies. He emphasized the role of inbreeding in reducing population viability due to the association of recessiveness with deleterious effects. Population structure in evolution involves two aspects: species multiplication and transformation. Partial isolation can lead to species splitting if environmental conditions differ. In a population with indiscriminate breeding, one genotype may dominate. In a subdivided population, local fluctuations in conditions can lead to different genotypes becoming predominant. Wright discussed the island model and isolation by distance, and how population structure influences evolution. He concluded that most species are restricted to niches by other species, but when new ecological opportunities arise, finely subdivided populations are most favorable for rapid exploitation. He also noted that cultural evolution, such as symbolic speech, represents a different type of evolution, but still depends on a balance between persistence and change. The most favorable condition for evolution is a finely divided population structure with balanced isolation and communication.The statement that cancer education is not true if conducted correctly is challenged, as many so-called neurotics seek reassurance that they do not have cancer. Cancer education is widespread, especially in the US, but methods vary by country. In Britain, local authorities are legally required to provide health education, and it is hoped that cancer education will be included to improve early diagnosis and reduce mortality. A pilot scheme in a large area could test different methods over one or two years. The Galton Lecture by Professor Sewall Wright discussed the genetical structure of populations. He noted that Mendel's genetic approach and Galton's statistical approach are complementary. In a randomly breeding population, gene frequencies remain stable, while in blending heredity, variability halves each generation. This principle was first described by Hardy and Weinberg in 1908. Wright also discussed how population structure affects genetic properties, and how changes in zygotic composition can alter these properties even without changes in gene frequencies. He emphasized the role of inbreeding in reducing population viability due to the association of recessiveness with deleterious effects. Population structure in evolution involves two aspects: species multiplication and transformation. Partial isolation can lead to species splitting if environmental conditions differ. In a population with indiscriminate breeding, one genotype may dominate. In a subdivided population, local fluctuations in conditions can lead to different genotypes becoming predominant. Wright discussed the island model and isolation by distance, and how population structure influences evolution. He concluded that most species are restricted to niches by other species, but when new ecological opportunities arise, finely subdivided populations are most favorable for rapid exploitation. He also noted that cultural evolution, such as symbolic speech, represents a different type of evolution, but still depends on a balance between persistence and change. The most favorable condition for evolution is a finely divided population structure with balanced isolation and communication.