Summary: In a comprehensive review of various topics related to population, the text discusses research on blood groups in anthropological studies, shedding and eruption of teeth in children, population theory, differential fertility, occupational groups, social classes, fertility data of married women, structure of population, food supply, and birth control practices. The text highlights research on various aspects of population demographics, including the impact of shifting time origins on data analysis and funding requirements for research projects. Additionally, it explores the widespread use of contraceptive methods and the implications for family planning in urban and rural settings, especially as mechanization of farms leads to population shifts from rural to urban areas. The text underscores the importance of understanding demographic changes and socio-cultural practices in shaping future population trends.